Fair Value Measurement - Schedule of Net Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Carrying Amount
Financial Assets [Abstract]
Investments in debt securities	$ 1,585	$ 1,551
Financial Liabilities [Abstract]
Total debt, excluding finance leases	22,663	23,384
Carrying Amount \| Commodity Contract
Financial Assets [Abstract]
Commodity derivatives	182	210
Financial Liabilities [Abstract]
Commodity derivatives	124	129
Estimate of Fair Value Measurement
Financial Assets [Abstract]
Investments in debt securities	1,585	1,551
Financial Liabilities [Abstract]
Total debt, excluding finance leases	22,447	22,997
Estimate of Fair Value Measurement \| Commodity Contract
Financial Assets [Abstract]
Commodity derivatives	182	210
Financial Liabilities [Abstract]
Commodity derivatives	$ 124	$ 129

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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+ Details

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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+ Details