Derivative Financial Instruments - Schedule of Derivative Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Assets:
Net Fair Value Presented in the Consolidated Balance Sheet	$ 4	$ 5
Liabilities:
Net Fair Value Presented in the Consolidated Balance Sheet	1,176	234
Derivatives	151	66
Derivatives not designated as hedging instruments \| Commodity price derivatives \| Derivatives - current
Assets:
Fair Value	4	5
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Fair Value Presented in the Consolidated Balance Sheet	4	5
Liabilities:
Fair Value	1,129	198
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Fair Value Presented in the Consolidated Balance Sheet	1,129	198
Derivatives not designated as hedging instruments \| Commodity price derivatives \| Derivatives - other noncurrent
Assets:
Fair Value	1	3
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Fair Value Presented in the Consolidated Balance Sheet	1	3
Derivatives not designated as hedging instruments \| Commodity price derivatives \| Derivatives - noncurrent
Liabilities:
Fair Value	110	11
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Derivatives	110	11
Derivatives not designated as hedging instruments \| Marketing derivatives \| Derivatives - current
Liabilities:
Fair Value	47	36
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Fair Value Presented in the Consolidated Balance Sheet	47	36
Derivatives not designated as hedging instruments \| Marketing derivatives \| Derivatives - noncurrent
Liabilities:
Fair Value	41	55
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Derivatives	$ 41	$ 55

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