Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Assets:
Deferred compensation plan assets	$ 74	$ 72
Investment in affiliate	135	123
Short-term investment	58
Assets, fair value disclosure	267	203
Liabilities:
Liabilities, fair value disclosure	563	300
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Deferred compensation plan assets	74	72
Investment in affiliate	135	123
Short-term investment	58
Assets, fair value disclosure	267	195
Liabilities:
Liabilities, fair value disclosure	0	0
Significant Other Observable Inputs (Level 2)
Assets:
Deferred compensation plan assets	0	0
Investment in affiliate	0	0
Short-term investment	0
Assets, fair value disclosure	0	8
Liabilities:
Liabilities, fair value disclosure	486	209
Significant Unobservable Inputs (Level 3)
Assets:
Deferred compensation plan assets	0	0
Investment in affiliate	0	0
Short-term investment	0
Assets, fair value disclosure	0	0
Liabilities:
Liabilities, fair value disclosure	77	91
Commodity derivatives
Assets:
Commodity price derivatives		8
Liabilities:
Commodity price and marketing derivatives	486	209
Commodity derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Commodity price derivatives		0
Liabilities:
Commodity price and marketing derivatives	0	0
Commodity derivatives | Significant Other Observable Inputs (Level 2)
Assets:
Commodity price derivatives		8
Liabilities:
Commodity price and marketing derivatives	486	209
Commodity derivatives | Significant Unobservable Inputs (Level 3)
Assets:
Commodity price derivatives		0
Liabilities:
Commodity price and marketing derivatives	0	0
Marketing derivatives
Liabilities:
Commodity price and marketing derivatives	77	91
Marketing derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1)
Liabilities:
Commodity price and marketing derivatives	0	0
Marketing derivatives | Significant Other Observable Inputs (Level 2)
Liabilities:
Commodity price and marketing derivatives	0	0
Marketing derivatives | Significant Unobservable Inputs (Level 3)
Liabilities:
Commodity price and marketing derivatives	$ 77	$ 91