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Fair Value Measurement - Schedule of Net Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Carrying Amount
Financial Assets [Abstract]
Investments in debt securities	$ 1,354	$ 1,222
Financial Liabilities [Abstract]
Total debt, excluding finance leases	17,906	15,323
Carrying Amount | Commodity Contract
Financial Assets [Abstract]
Commodity derivatives	243	824
Financial Liabilities [Abstract]
Commodity derivatives	162	782
Estimate of Fair Value Measurement
Financial Assets [Abstract]
Investments in debt securities	1,354	1,222
Financial Liabilities [Abstract]
Total debt, excluding finance leases	17,375	15,545
Estimate of Fair Value Measurement | Commodity Contract
Financial Assets [Abstract]
Commodity derivatives	243	824
Financial Liabilities [Abstract]
Commodity derivatives	$ 162	$ 782

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