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Fair Value Measurement - Net Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Carrying Amount
Financial assets
Commodity derivatives	$ 345	$ 824
Investments in debt securities	1,424	1,222
Financial liabilities
Total debt, excluding finance leases	17,808	15,323
Carrying Amount | Commodity
Financial liabilities
Commodity derivatives	225	782
Fair Value
Financial assets
Commodity derivatives	345	824
Investments in debt securities	1,424	1,222
Financial liabilities
Total debt, excluding finance leases	18,621	15,545
Fair Value | Commodity
Financial liabilities
Commodity derivatives	$ 225	$ 782

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