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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-Q

(Mark One)

For the quarterly period ended March 31, 2016

or

For the transition period from                      to                     

Commission file number: 001-34726

LYONDELLBASELL INDUSTRIES N.V.

(Exact name of registrant as specified in its charter)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  x

Indicate by check mark whether the registrant has filed all documents and reports required to be filed by Sections 12, 13 or 15(d) of the Securities Exchange Act of 1934 subsequent to the distribution of securities under a plan confirmed by a court.    Yes  x    No  ¨

The registrant had 426,727,144 ordinary shares, €0.04 par value, outstanding at April 20, 2016 (excluding 151,708,126 treasury shares).

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LYONDELLBASELL INDUSTRIES N.V.

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PART I. FINANCIAL INFORMATION

ITEM 1. CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

LYONDELLBASELL INDUSTRIES N.V.

CONSOLIDATED STATEMENTS OF INCOME

See Notes to the Consolidated Financial Statements.

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

See Notes to the Consolidated Financial Statements.

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LYONDELLBASELL INDUSTRIES N.V.

CONSOLIDATED BALANCE SHEETS

See Notes to the Consolidated Financial Statements.

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LYONDELLBASELL INDUSTRIES N.V.

CONSOLIDATED BALANCE SHEETS

See Notes to the Consolidated Financial Statements.

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LYONDELLBASELL INDUSTRIES N.V.

CONSOLIDATED STATEMENTS OF CASH FLOWS

See Notes to the Consolidated Financial Statements.

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CONSOLIDATED STATEMENTS OF CASH FLOWS

See Notes to the Consolidated Financial Statements.

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LYONDELLBASELL INDUSTRIES N.V.

CONSOLIDATED STATEMENT OF STOCKHOLDERS’ EQUITY

See Notes to the Consolidated Financial Statements.

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NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

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NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

LyondellBasell Industries N.V., together with its consolidated subsidiaries (collectively “LyondellBasell N.V.”), is a worldwide manufacturer of chemicals and polymers, a refiner of crude oil, a significant producer of gasoline blending components and a developer and licensor of technologies for production of polymers. Unless otherwise indicated, the “Company,” “we,” “us,” “our” or similar words are used to refer to LyondellBasell N.V.

The accompanying Consolidated Financial Statements are unaudited and have been prepared from the books and records of LyondellBasell N.V. in accordance with the instructions to Form 10-Q and Rule 10-1 of Regulation S-X for interim financial information. Accordingly, they do not include all of the information and notes required by accounting principles generally accepted in the United States (“U.S. GAAP”) for complete financial statements. In our opinion, all adjustments, consisting only of normal recurring adjustments, considered necessary for a fair presentation have been included. The results for interim periods are not necessarily indicative of results for the entire year. These Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and notes thereto for the year ended December 31, 2015.

Recently Adopted Guidance

Compensation—In June 2014, the FASB issued ASU 2014-12, Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. Under this new guidance, entities are required to treat performance targets that affect vesting and could be achieved after the requisite service period as a performance condition. The amendments in this ASU were effective for annual and interim periods beginning after December 15, 2015. Early adoption is permitted. The adoption of this amendment did not have a material impact on our Consolidated Financial Statements.

Consolidation—In February 2015, the FASB issued ASU 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis, which amends and changes the consolidation analysis currently required under U.S. GAAP. This ASU modifies the process used to evaluate whether limited partnerships and similar entities are variable interest entities (“VIEs”) or voting interest entities; affects the analysis performed by reporting entities regarding VIEs, particularly those with fee arrangements and related party relationships; and provides a scope exception for certain investment funds. The amendments in this update were effective for annual and interim periods beginning after December 15, 2015. Early adoption is permitted. The adoption of this amendment did not have a material impact on our Consolidated Financial Statements.

Accounting Guidance Issued But Not Adopted as of March 31, 2016

Revenue Recognition—In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), which supersedes the current revenue recognition requirements in Accounting Standard Codification (“ASC”) 606, Revenue Recognition. Under this guidance, entities should recognize revenues to depict the transfer of promised goods or services to customers in an amount that reflects the consideration the entity expects to receive in exchange for those goods or services. This ASU also requires enhanced disclosures. In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, which deferred the original effective date for one year to annual and interim periods beginning after December 15, 2017. Retrospective and modified retrospective application is allowed. We are currently assessing the impact of this amendment on our Consolidated Financial Statements.

Going Concern—In August 2014, the FASB issued ASU 2014-15, Presentation of Financial Statements–Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern.

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NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Under this new guidance, management is required to perform interim and annual assessments of an entity’s ability to continue as a going concern within one year of the date the financial statements are issued (or available to be issued when applicable). Additionally, the entity must provide certain disclosures if conditions or events raise substantial doubt about its ability to continue as a going concern. The amendments in this update are effective for annual periods ending after December 15, 2016 and interim periods thereafter. Early adoption is permitted. The application of this amendment is not expected to have a material impact on our Consolidated Financial Statements.

Inventories—In July 2015, the FASB issued ASU 2015-11, Inventory (Topic 330): Simplifying the Measurement of Inventory. Under this new guidance, entities that measure inventory using any method other than last-in, first-out or the retail inventory method will be required to measure inventory at the lower of cost and net realizable value. The amendments in this ASU, which should be applied prospectively, are effective for annual and interim periods beginning after December 15, 2016. Early adoption is permitted. The application of this amendment is not expected to have a material impact on our Consolidated Financial Statements.

Financial Instruments—In January 2016, the FASB issued ASU 2016-01, Financial Instruments–Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The new guidance in this ASU includes a requirement for equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. Prospective application of this ASU is required for public entities for annual and interim periods beginning on or after December 15, 2017. We are currently assessing the impact of this new guidance on our Consolidated Financial Statements.

Leases—In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), creating Topic 842 which supersedes the existing guidance for lease accounting in ASC 840, Leases. Under the new guidance, for leases with a term longer than 12 months a lessee should recognize in the statement of financial position a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. Topic 842 retains a classification distinction between finance leases and operating leases, with the classification affecting the pattern of expense recognition in the income statement. This ASU also requires enhanced disclosures. A modified retrospective transition approach is required for annual and interim periods beginning on or after December 15, 2018. Early adoption is permitted. We are currently assessing the impact of this new guidance on our Consolidated Financial Statements.

Derivatives and Hedging—In March 2016, the FASB issued ASU 2016-06, Derivatives and Hedging (Topic 815): Contingent Put and Call Options in Debt Instruments. The ASU clarifies that in assessing whether an embedded contingent put or call option is clearly and closely related to the debt host, an entity is required to apply only the four-step decision sequence as described in the amended guidance. The ASU is effective for public entities for annual and interim periods beginning after December 15, 2016. Early adoption is permitted. We are currently assessing the impact of the amended guidance on our Consolidated Financial Statements.

Investments—In March 2016, the FASB issued ASU 2016-07, Investments–Equity Method and Joint Ventures (Topic 323): Simplifying the Transition to the Equity Method of Accounting. This ASU simplifies the recognition and reporting requirements for investments that become qualified for the equity method of accounting as a result of an increase in the level of ownership interest or degree of influence. The amendments in this ASU are effective for all entities for annual and interim periods beginning after December 15, 2016. Prospective application is required to increases in the level of ownership interest or degree of influence that result in the adoption of the equity method. Early adoption is permitted. We are currently assessing the impact of the amendments in this guidance on our Consolidated Financial Statements.

Compensation—In March 2016, the FASB issued ASU 2016-09, Compensation–Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. This ASU simplifies several aspects of the

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NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The amendments in this ASU are effective for public entities for annual and interim periods beginning after December 15, 2016. Various transition methods are prescribed depending on the aspect of accounting impacted by the amended guidance. Early adoption is permitted. We are currently assessing the impact of the amendments in this guidance on our Consolidated Financial Statements.

Our allowance for doubtful accounts receivable, which is reflected in the Consolidated Balance Sheets as a reduction of accounts receivable, totaled $18 million and $24 million at March 31, 2016 and December 31, 2015, respectively.

Inventories consisted of the following components:

For information related to lower of cost or market inventory valuation adjustments recognized during the first quarter of 2016, see Note 13.

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NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Long-term loans, notes and other long-term debt consisted of the following:

Our 5% senior notes due 2019 include losses of $19 million and $9 million for the three months ended March 31, 2016 and 2015, respectively, and gains of $35 million for the year ended December 31, 2015, related to adjustments for our fixed-for-floating interest rate swaps, which are recognized in Interest expense in the Consolidated Statements of Income. Since inception in 2014, we have recognized net gains of $23 million related to adjustments for these fixed-for-floating interest rate swaps.

Short-term loans, notes, and other short-term debt consisted of the following:

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Long-Term Debt

Guaranteed Notes due 2022—In March 2016, LYB International Finance II B.V. (“LYB Finance II”), a direct, 100% owned finance subsidiary of LyondellBasell Industries N.V., as defined in Rule 3-10(b) of Regulation S-X, issued €750 million of 1.875% guaranteed notes due 2022 at a discounted price of 99.607%.

These unsecured notes, which are fully and unconditionally guaranteed by LyondellBasell Industries N.V., rank equally in right of payment to all of LYB Finance II’s existing and future unsecured indebtedness and to all of LyondellBasell N.V.’s existing and future unsubordinated indebtedness. There are no significant restrictions that would impede the Guarantor from obtaining funds by dividend or loan from its subsidiaries.

The indenture governing these notes contains limited covenants, including those restricting our ability and the ability of our subsidiaries to incur indebtedness secured by significant property or by capital stock of subsidiaries that own significant property, enter into certain sale and lease-back transactions with respect to any significant property or enter into consolidations, mergers or sales of all or substantially all of our assets.

The notes may be redeemed before the date that is three months prior to the scheduled maturity date at a redemption price equal to the greater of 100% of the principal amount of the notes redeemed and the sum of the present values of the remaining scheduled payments of principal and interest (discounted at the applicable Comparable Government Bond Rate plus 35 basis points) on the notes to be redeemed. The notes may also be redeemed on or after the date that is three months prior to the final maturity date of the notes at a redemption price equal to 100% of the principal amount of the notes redeemed plus accrued and unpaid interest. The notes are also redeemable upon certain tax events.

Short-Term Debt

Senior Revolving Credit Facility—Our revolving credit facility, which expires in June 2020, may be used for dollar and euro denominated borrowings, has a $500 million sublimit for dollar and euro denominated letters of credit, and supports our commercial paper program. The aggregate balance of outstanding borrowings and letters of credit under this facility may not exceed $2,000 million at any given time. Borrowings under the facility bear interest at a Base Rate or LIBOR, plus an applicable margin. Additional fees are incurred for the average daily unused commitments.

The facility contains customary covenants and warranties, including specified restrictions on indebtedness and liens. In addition, we are required to maintain a leverage ratio at the end of every quarter of 3.50 to 1.00 or less for the period covering the most recent four quarters. We are in compliance with these covenants as of March 31, 2016. At March 31, 2016, we had $500 million of outstanding commercial paper, no outstanding letters of credit and no outstanding borrowings under this facility.

Commercial Paper Program—We have a commercial paper program under which we may issue up to $2,000 million of privately placed, unsecured, short-term promissory notes (“commercial paper”). This program is backed by our $2,000 million Senior Revolving Credit Facility. Proceeds from the issuance of commercial paper may be used for general corporate purposes, including dividends and share repurchases.

U.S. Receivables Securitization Facility—Our $900 million U.S. accounts receivable securitization facility, which expires in 2018, has a purchase limit of $900 million in addition to a $300 million uncommitted accordion feature. This facility provides liquidity through the sale or contribution of trade receivables by certain of our U.S. subsidiaries to a wholly owned, bankruptcy-remote subsidiary on an ongoing basis and without recourse. The bankruptcy-remote subsidiary may then, at its option and subject to a borrowing base of eligible receivables, sell undivided interests in the pool of trade receivables to financial institutions participating in the facility. In the event

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of liquidation, the bankruptcy-remote subsidiary’s assets will be used to satisfy the claims of its creditors prior to any assets or value in the bankruptcy-remote subsidiary becoming available to us. We are responsible for servicing the receivables. This facility also provides for the issuance of letters of credit up to $200 million. The term of the securitization facility may be extended in accordance with the terms of the agreement. At March 31, 2016, there were no borrowings or letters of credit outstanding under the facility.

European Receivables Securitization Facility—Our €450 million European receivables securitization facility expired in April 2016. Under the terms of the agreement availability under the facility ceased following notification on March 15, 2016 of our intent not to extend the facility. There were no borrowings outstanding under this facility at March 31, 2016.

Other—At March 31, 2016 and December 31, 2015, our weighted average interest rate on outstanding short-term debt was 0.7%.

Debt Discount and Issuance Costs

Amortization of debt discounts and debt issuance costs resulted in amortization expense of $4 million in each of the three months ended March 31, 2016 and 2015, which is included in Interest expense in the Consolidated Statements of Income.

Cash Concentration—Our cash equivalents are placed in high-quality commercial paper, money market funds and time deposits with major international banks and financial institutions.

Market Risks—We are exposed to market risks, such as changes in commodity pricing, currency exchange rates and interest rates. To manage the volatility related to these exposures, we selectively enter into derivative transactions pursuant to our risk management policies. Derivative instruments are recorded at fair value on the balance sheet. Gains and losses related to changes in the fair value of derivative instruments not designated as hedges are recorded in earnings. For derivatives that have been designated as fair value hedges, the gains and losses of the derivatives and hedged instruments are recorded in earnings. For derivatives designated as cash flow and net investment hedges, the effective portion of the gains and losses is recorded through Other comprehensive income (loss). The ineffective portion of cash flow and net investment hedges is recorded in earnings.

Marketable Securities—We invest cash in investment-grade securities for periods generally not exceeding two years. Investments in securities with original maturities of three months or less are classified as Cash and cash equivalents. At March 31, 2016 and December 31, 2015, we had marketable securities classified as Cash and cash equivalents of $580 million and $575 million, respectively.

We also have investments in marketable securities classified as available-for-sale. These securities, which are included in Short-term investments on the Consolidated Balance Sheets, are carried at estimated fair value with unrealized gains and losses recorded as a component of Accumulated other comprehensive income (“AOCI”). We periodically review our available-for-sale securities for other-than-temporary declines in fair value below the cost basis, and when events or changes in circumstances indicate the carrying value of an asset may not be recoverable, the investment is written down to fair value, establishing a new cost basis.

Repurchase Agreements—We invest in tri-party repurchase agreements. Under these agreements, we make cash purchases of securities according to a pre-agreed profile from our counterparties. The counterparties have an obligation to repurchase, and we have an obligation to sell, the same or substantially the same securities at a pre-defined date for a price equal to the purchase price plus interest. These securities, which pursuant to our policy are held by a third-party custodian and must generally have a minimum collateral value of 102%, secure the

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counterparty’s obligation to repurchase the securities. Depending upon maturity, these tri-party repurchase agreements are treated as short-term loans receivable and are reflected in Prepaid expenses and other current assets or as long-term loans receivable reflected in Other investments and long-term receivables on our Consolidated Balance Sheets. The balance of our investment at March 31, 2016 and December 31, 2015 was $302 million and $387 million, respectively.

Commodity Prices—We are exposed to commodity price volatility related to anticipated purchases of natural gas liquids, crude oil and other raw materials and sales of our products. We selectively use over-the counter commodity swaps, options and exchange traded futures contracts with various terms to manage the volatility related to these risks. In addition, we are exposed to volatility on the prices of precious metals to the extent that we have obligations, classified as embedded derivatives, tied to the price of precious metals associated with secured borrowings. All aforementioned contracts are generally limited to durations of one year or less. At March 31, 2016, commodity futures contracts in the notional amount of $52 million, maturing from May 2016 to October 2016, were outstanding.

Foreign Currency Rates—We have significant worldwide operations. The functional currencies of our consolidated subsidiaries through which we operate are primarily the U.S. dollar and the euro. We enter into transactions denominated in currencies other than our designated functional currencies. As a result, we are exposed to foreign currency risk on receivables and payables. We maintain risk management control policies intended to monitor foreign currency risk attributable to our outstanding foreign currency balances. These control policies involve the centralization of foreign currency exposure management, the offsetting of exposures and the estimating of expected impacts of changes in foreign currency rates on our earnings. We enter into foreign currency forward contracts to reduce the effects of our net currency exchange exposures. At March 31, 2016, foreign currency forward contracts in the notional amount of $32 million, maturing from April 2016 through June 2016, were outstanding.

For forward contracts that economically hedge recognized monetary assets and liabilities in foreign currencies and that are not designated as net investment hedges, no hedge accounting is applied. Changes in the fair value of foreign currency forward contracts, which are reported in the Consolidated Statements of Income, are offset in part by the currency translation results recognized on the assets and liabilities.

Foreign Currency Gain (Loss)—Other income, net, in the Consolidated Statements of Income reflected a loss of $3 million and a gain of $8 million for the three months ended March 31, 2016 and 2015, respectively.

Basis Swaps—In 2015, we entered into cross-currency floating-to-floating interest rate swaps (“basis swaps”) to reduce the volatility in stockholders’ equity resulting from changes in currency exchange rates of our foreign subsidiaries with respect to the U.S. dollar. Under the terms of these contracts, which have been designated as net investment hedges, we will make interest payments in euros at 3 Month EURIBOR plus basis and will receive interest in U.S. dollars at 3 Month LIBOR. Upon the maturities of these contracts, we will pay the principal amount in euros and receive U.S. dollars from our counterparties.

We use the long-haul method to assess hedge effectiveness using a regression analysis approach under the hypothetical derivative method. We perform the regression analysis of our basis swap contracts at least on a quarterly basis over an observation period of three years, utilizing data that is relevant to the hedge duration. We use the forward method to measure ineffectiveness.

The effective portion of the unrealized gains and losses on these basis swap contracts is reported within Foreign currency translation adjustments in Accumulated other comprehensive loss and reclassified to earnings only when realized upon the sale or upon complete or substantially complete liquidation of the investment in the foreign entity. Cash flows from basis swaps are reported in Cash flows from investing activities in the Consolidated Statement of Cash Flows.

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There was no ineffectiveness recorded during the three months ended March 31, 2016.

The following table summarizes the notional and fair value of our basis swaps outstanding:

Forward Exchange Contracts—In 2015, we entered into forward exchange contracts with an aggregate notional value of €750 million ($795 million) to mitigate the risk associated with the fluctuations in the Euro to U.S. Dollar exchange rate related to our investments in foreign subsidiaries.

These forward exchange contracts, which were designated as net investment hedges, expired on March 31, 2016. Upon settlement of these contracts, we paid €750 million ($850 million at the expiry spot rate) to our counterparties and received $795 million from our counterparties. The $55 million difference, which includes a $30 million loss in the first quarter of 2016, is reflected within foreign currency translation adjustments in Accumulated other comprehensive loss. Cash flows from these forward exchange contracts are reported in Cash flows from investing activities in the Consolidated Statement of Cash Flows.

There was no ineffectiveness recorded for this hedging relationship during the three months ended March 31, 2016.

Guaranteed Euro Notes Due 2022—In March 2016, we issued euro denominated notes payable due 2022 (“Euro notes”) with notional amounts totaling €750 million. To mitigate the risk to our investments in foreign subsidiaries associated with fluctuations in the euro to U.S. Dollar exchange rate, we designated these Euro notes as a net investment hedge.

We use the critical terms match to assess both prospective and retrospective hedge effectivenessby comparing the spot rate change in the Euro notes and the spot rate change in the designated net investment. We use the hypothetical derivative method to measure hedge ineffectiveness.

The effective portion of the gain or loss is recorded within foreign currency translation adjustments in Accumulated other comprehensive loss and will be reclassified to earnings only when realized upon the sale of or the complete or substantially complete liquidation of the investment in the foreign entity. In periods where the hedging relationship is deemed ineffective, changes in remeasurement of the Euro notes due to changes in the spot exchange rate will be recorded directly to Other income, net in the Consolidated Statements of Income. Cash flows related to our Euro notes are reported in Cash flows from financing activities and related interest payments are reported in Cash flows from operating activities in the Consolidated Statement of Cash Flows.

There was no ineffectiveness recorded for this hedging relationship in the three months ended March 31, 2016.

Cross-Currency Swaps—We have cross-currency swap contracts that reduce our exposure to the foreign currency exchange risk associated with certain intercompany loans. Under the terms of these contracts, which have been designated as cash flow hedges, we will make interest payments in euros and receive interest in U.S. dollars. Upon the maturities of these contracts, we will pay the principal amount of the loans in euros and receive U.S. dollars from our counterparties.

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We use the long-haul method to assess hedge effectiveness using a regression analysis approach under the hypothetical derivative method. We perform the regression analysis over an observation period of three years, utilizing data that is relevant to the hedge duration. We use the dollar offset method under the hypothetical derivative method to measure ineffectiveness.

The effective portion of the unrealized gains and losses on these cross-currency swap contracts is reported in Accumulated other comprehensive loss and reclassified to earnings over the period that the hedged intercompany loans affect earnings based on changes in spot rates. The ineffective portion of the unrealized gains and losses is recorded directly to Other income, net in the Consolidated Statements of Income. In addition, the swaps are marked-to-market each reporting period with the euro notional values measured based on the current foreign exchange spot rate.

There was no ineffectiveness recorded during each of the three months ended March 31, 2016 and 2015.

The following table summarizes our cross-currency swaps outstanding:

Forward-Starting Interest Rate Swaps—In March 2015, we entered into forward-starting interest rate swaps to mitigate the risk of adverse changes in the benchmark interest rates on the anticipated refinancing of our senior notes due 2019. These interest rate swaps will be terminated upon debt issuance. The total notional amount of these forward-starting interest rate swaps was $1,000 million at March 31, 2016. The ineffectiveness recorded for this hedging relationship was less than $1 million in the three months ended March 31, 2016. There was no ineffectiveness recorded for this hedging relationship in the three months ended March 31, 2015.

In January 2015, we entered into forward-starting interest rate swaps with a total notional value of $750 million to mitigate the risk of adverse changes in the benchmark interest rates on the Company’s planned issuance of fixed-rate debt in 2015. These forward-starting interest rate swaps were terminated upon issuance of the $1,000 million senior notes due 2055 in March 2015. The ineffectiveness recorded for this hedging relationship was less than $1 million during the three months ended March 31, 2015.

We have elected to designate these forward-starting interest rate swaps as cash flow hedges. The effective portion of the gain or loss is recorded in Accumulated other comprehensive loss. In periods where the hedging relationship is deemed ineffective, changes in the fair value will be recorded as Interest expense in the Consolidated Statements of Income.

We use a regression analysis approach under the hypothetical derivative method to assess both prospective and retrospective hedge effectiveness. We use the dollar-offset method under the hypothetical derivative method to measure hedge ineffectiveness.

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There was no settlement of our forward-starting swap agreements during the three months ended March 31, 2016. We recognized a gain of $15 million in Accumulated other comprehensive loss related to the settlement of our forward-starting interest rate swap agreements during the three months ended March 31, 2015. The related deferred gains and losses recognized in Accumulated other comprehensive loss are amortized to interest expense over the original term of the related swaps using the effective interest method.

As of March 31, 2016, less than $1 million (on a pretax basis) is scheduled to be reclassified as an increase to interest expense over the next twelve months.

Fixed-for-Floating Interest Rate Swaps—We have U.S. dollar fixed-for-floating interest rate swaps with third party financial institutions to mitigate changes in the fair value of our $2,000 million 5% senior notes due 2019 associated with the risk of variability in the 3 Month USD LIBOR rate (the benchmark interest rate). These interest rate swaps are used as part of our current interest rate risk management strategy to achieve a desired proportion of variable versus fixed rate debt.

Under these arrangements, we exchange fixed-rate for floating-rate interest payments to effectively convert our fixed-rate debt to floating rate-debt. The fixed and variable cash payments related to the interest rate swaps are net settled semi-annually and classified as Other, net, in the Cash flows from operating activities section of the Consolidated Statements of Cash Flows.

We have elected to designate these fixed-for-floating interest rate swaps as fair value hedges. We use the long-haul method to assess hedge effectiveness using a regression analysis approach. We perform the regression analysis over an observation period of three years, utilizing data that is relevant to the hedge duration. We use the dollar offset method to measure ineffectiveness.

Changes in the fair value of the derivatives and changes in the value of the hedged items based on changes in the benchmark interest rate are recorded as Interest expense in our Consolidated Statements of Income. We evaluate the effectiveness of the hedging relationship periodically and calculate the changes in the fair value of the derivatives and the underlying hedged items separately. We recognized net gains of $9 million and $11 million for the three months ended March 31, 2016 and 2015, respectively, related to the ineffectiveness of our hedging relationships.

At March 31, 2016, we had outstanding interest rate swap agreements with notional amounts of $2,000 million, maturing on April 15, 2019.

Available-for-Sale Securities—The following table summarizes the amortized cost, gross unrealized gains and losses, and fair value of available-for-sale securities measured on a recurring basis that are outstanding as of March 31, 2016 and December 31, 2015. Refer to Note 7 for additional information regarding the fair value of available-for-sale securities.

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Our limited partnership investments include investments in, among other things, equities and equity related securities, debt securities, credit instruments, global interest rate products, currencies, commodities, futures, options, warrants and swaps. These investments, which include both long and short positions, may be redeemed at least monthly with advance notice ranging up to ninety days. The fair value of these funds is estimated using the net asset value (NAV) per share of the respective pooled fund investment.

No losses related to other-than-temporary impairments of our available-for-sale investments have been recorded in Accumulated other comprehensive loss during the three months ended March 31, 2016 and the year ended December 31, 2015.

As of March 31, 2016, the commercial paper securities held by the Company had maturities between two and twelve months, bonds had maturities between five and eighteen months, certificates of deposit mature between ten and twenty four months,; and limited partnership investments mature between one and three months.

The proceeds from maturities and sales of our available-for-sale securities during the three months ended March 31, 2016 and 2015 are summarized in the following table.

No gain or loss was realized in connection with the sales of securities during the three months ended March 31, 2016. We recognized realized a gain of less than $1 million in connection with the sale of securities during the three months ended 2015.

The specific identification method was used to identify the cost of the securities sold and the amounts reclassified out of Accumulated other comprehensive income into earnings.

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NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

The following table summarizes the fair value and unrealized losses related to available-for-sale securities that were in a continuous unrealized loss position for less than and greater than twelve months as of March 31, 2016 and December 31, 2015.

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NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Financial Instruments—The following table summarizes financial instruments outstanding as of March 31, 2016 and December 31, 2015 that are measured at fair value on a recurring basis. Refer to Note 7 for additional information regarding the fair value of financial instruments.

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NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

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NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

The following table summarizes the pretax effect of derivative instruments charged directly to income.

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NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

The pretax effect of additional gain recognized in income for the fixed-for-floating interest rate swaps includes the net value for accrued interest of $6 million and $8 million for the three months ended March 31, 2016 and 2015, respectively.

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NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

The following table presents the financial instruments outstanding as of March 31, 2016 and December 31, 2015 that are measured at fair value on a recurring basis.

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NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS—(Continued)