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DEBT
 3 Months Ended
Mar. 31, 2024
Debt Disclosure [Abstract]  
DEBT DEBT
The carrying value of debt outstanding, net of unamortized debt issuance costs, was as follows at March 31, 2024 and December 31, 2023:
March 31, 2024December 31, 2023
(in millions)
Short-term debt:
Commercial paper$250 $871 
Senior notes:
$600 million, 3.850% due October 1, 2024
572 572 
Total senior notes572 572 
Total short-term debt$822 $1,443 
Long-term debt:
Senior notes:
$600 million, 4.500% due April 1, 2025
$599 $598 
$500 million, 5.700% due March 13, 2026
498 498 
$750 million, 1.350% due February 3, 2027
688 688 
$600 million, 3.950% due March 15, 2027
537 537 
$500 million, 5.750% due March 1, 2028
495 495 
$500 million, 5.750% due December 1, 2028
495 495 
$750 million, 3.700% due March 23, 2029
590 590 
$500 million, 3.125% due August 15, 2029
433 433 
$500 million, 4.875% due April 1, 2030
496 496 
$1,250 million, 5.375% due April 15, 2031
1,238 — 
$750 million, 2.150% due February 3, 2032
744 743 
$750 million, 5.875% due March 1, 2033
735 750 
$850 million, 5.950% due March 15, 2034
826 840 
$250 million, 8.150% due June 15, 2038
261 261 
$400 million, 4.625% due December 1, 2042
396 396 
$750 million, 4.950% due October 1, 2044
740 740 
$400 million, 4.800% due March 15, 2047
396 396 
$500 million, 3.950% due August 15, 2049
514 529 
$750 million, 5.500% due March 15, 2053
720 728 
$1,000 million, 5.750% due April 15, 2054
989 — 
Total senior notes12,390 10,213 
Total long-term debt$12,390 $10,213 
Senior Notes
In March 2024, we issued $1.3 billion of 5.375% unsecured senior notes due April 15, 2031 and $1.0 billion of 5.750% unsecured senior notes due April 15, 2054. Our net proceeds, reduced for the underwriters' discounts and commissions paid, were $2.2 billion. We used the net proceeds for general corporate purposes, which include the repayment of existing indebtedness, including borrowings under our commercial paper program.
We have entered into interest-rate swap agreements with major financial institutions to convert our interest-rate exposure on some of our senior notes payable from fixed rates to variable rates, based on SOFR, to align interest costs more closely with floating interest rates received on our cash equivalents and investment securities, as further described in Note 5. As a result, the carrying value of these senior notes has been adjusted to reflect changes in value
caused by an increase or decrease in interest rates. The cumulative, aggregate adjustment to the carrying value of the senior notes was approximately $17 million at March 31, 2024.

For additional information regarding our Senior Notes, refer to Note 13 to the audited Consolidated Financial Statements included in Part II, Item 8, "Financial Statements and Supplementary Data" in our 2023 Form 10-K.
Revolving Credit Agreements
In June 2023, we entered into an amended and restated 5-year, $2.5 billion unsecured revolving credit agreement (replacing the 5-year, $2.5 billion unsecured revolving credit agreement entered in June 2021) and entered into a 364-day $1.5 billion unsecured revolving credit agreement (replacing the 364-day $1.5 billion unsecured revolving credit agreement entered in June 2022, which expired in accordance with its terms).
Under the credit agreements, at our option, we can borrow on either a competitive advance basis or a revolving credit basis. The revolving credit portion bears interest at Term SOFR or the base rate plus a spread. The competitive advance portion of any borrowings will bear interest at market rates prevailing at the time of borrowing on either a fixed rate or a floating rate based Term SOFR, at our option.
The SOFR spread, currently 114.0 basis points under the 5-year revolving credit agreement and 116.0 basis points under the 364-day revolving credit agreement, varies depending on our credit ratings ranging from 92.0 to 130.0 basis points under the 5-year revolving credit agreement and from 94.0 to 135.0 basis points under the 364-day revolving credit agreement. We also pay an annual facility fee regardless of utilization. This facility fee, currently 11.0 basis points, under the 5-year revolving credit agreement and 15.0 basis points under the 364-day revolving agreement, varies depending on our credit ratings ranging from 8.0 to 20.0 basis points under the 5-year revolving credit agreement and from 6.0 to 15.0 basis points under the 364-day revolving credit agreement.
Our credit agreements contain customary restrictive covenants and a financial covenant regarding maximum debt to capitalization of 60%, as well as customary events of default. We are in compliance with this financial covenant, with actual debt to capitalization of 45.1% as measured in accordance with the revolving credit agreements as of March 31, 2024.
At March 31, 2024, we had no borrowings and approximately $18 million of letters of credit outstanding under the revolving credit agreements. Accordingly, as of March 31, 2024, we had $2.482 billion of remaining borrowing capacity under the 5-year revolving credit agreement and $1.5 billion of remaining borrowing capacity under the 364-day revolving credit agreement (which excludes the uncommitted $750 million of incremental loan facilities), none of which would be restricted by our financial covenant compliance requirement.
For additional information regarding our Revolving Credit Agreements, refer to Note 13 to the audited Consolidated Financial Statements included in Part II, Item 8, "Financial Statements and Supplementary Data" in our 2023 Form 10-K.
Commercial Paper
Under our commercial paper program we may issue short-term, unsecured commercial paper notes privately placed on a discount basis through certain broker dealers at any time. Amounts available under the program may be borrowed, repaid and re-borrowed from time to time. The net proceeds of issuances have been and are expected to be used for general corporate purposes. The maximum principal amount outstanding at any one time during the three months ended March 31, 2024 was $2.7 billion, with $0.3 billion outstanding at March 31, 2024 compared to $0.9
billion outstanding at December 31, 2023. The outstanding commercial paper at March 31, 2024 had a weighted average annual interest rate of 5.46%.
For additional information regarding our Commercial Paper refer to Note 13 to the audited Consolidated Financial Statements included in Part II, Item 8, "Financial Statements and Supplementary Data" in our 2023 Form 10-K.
Other Short-term Borrowings
We are a member, through one subsidiary, of the Federal Home Loan Bank of Cincinnati, or FHLB. As a member we have the ability to obtain short-term cash advances, subject to certain minimum collateral requirements. At March 31, 2024 we had no outstanding short-term FHLB borrowings.