Risk Management Activities (Details)		3 Months Ended
		Mar. 31, 2022 USD ($) BTU $ / bbl bbl	May 04, 2022 USD ($)	Dec. 31, 2021 USD ($)
Derivatives, Fair Value [Line Items]
Liabilities from Price Risk Management Activities | $		$ 260,000,000		$ 269,000,000
Derivative Collateral [Abstract]
Collateral Posted On Derivative | $		2,275,000,000
Collateral Already Posted On Derivative | $		2,415,000,000		140,000,000
Collateral Held on Derivative | $		0		0
Subsequent Event
Derivative Collateral [Abstract]
Collateral Already Posted On Derivative | $			$ 2,900,000,000
Assets From Price Risk Management Activities | Price Risk Derivative
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset | $	[1]			7,000,000
Derivative Liability, Fair Value, Gross Liability | $	[1]			1,000,000
Other Assets | Price Risk Derivative
Derivatives, Fair Value [Line Items]
Derivative Asset, Noncurrent | $	[1]	0		6,000,000
Liabilities From Price Risk Management Activities | Price Risk Derivative
Derivatives, Fair Value [Line Items]
Liabilities from Price Risk Management Activities | $	[2]	260,000,000		269,000,000
Derivative Asset, Fair Value, Gross Asset | $	[2]	13,000,000		29,000,000
Derivative Liability, Fair Value, Gross Liability | $	[2]	1,948,000,000		421,000,000
Derivative Collateral [Abstract]
Collateral Posted On Derivative | $	[2]	1,675,000,000		123,000,000
Other Liabilities | Price Risk Derivative
Derivatives, Fair Value [Line Items]
Derivative Liability, Noncurrent | $	[3]	110,000,000		37,000,000
Derivative Asset, Fair Value, Gross Asset | $	[3]	10,000,000		10,000,000
Derivative Liability, Fair Value, Gross Liability | $	[3]	860,000,000		64,000,000
Derivative Collateral [Abstract]
Collateral Posted On Derivative | $	[3]	$ 740,000,000		$ 17,000,000
Crude Oil | Derivative Contracts - January through March (closed) | Price Swaps
Derivatives, Fair Value [Line Items]
Volume (Bbld) | bbl		140
Weighted Average Price		65.58
Crude Oil | Offsetting Derivative Contracts - January through March (closed) | Price Swaps
Derivatives, Fair Value [Line Items]
Volume (Bbld) | bbl		0
Weighted Average Price		0
Crude Oil | Derivative Contracts - April through June | Price Swaps
Derivatives, Fair Value [Line Items]
Volume (Bbld) | bbl		140
Weighted Average Price		65.62
Crude Oil | Offsetting Derivative Contracts - April through June | Price Swaps
Derivatives, Fair Value [Line Items]
Volume (Bbld) | bbl		0
Weighted Average Price		0
Crude Oil | Derivative Contracts - July through September | Price Swaps
Derivatives, Fair Value [Line Items]
Volume (Bbld) | bbl		140
Weighted Average Price		65.59
Crude Oil | OffSetting Derivative Contracts - July through September | Price Swaps
Derivatives, Fair Value [Line Items]
Volume (Bbld) | bbl		0
Weighted Average Price		0
Crude Oil | Derivative Contracts - October through December | Price Swaps
Derivatives, Fair Value [Line Items]
Volume (Bbld) | bbl		140
Weighted Average Price		65.68
Crude Oil | OffSetting Derivative Contracts - October and December | Price Swaps
Derivatives, Fair Value [Line Items]
Volume (Bbld) | bbl		78
Weighted Average Price		88.73
Crude Oil | Derivative Contracts - January through March - Year Two | Price Swaps
Derivatives, Fair Value [Line Items]
Volume (Bbld) | bbl		150
Weighted Average Price		67.92
Crude Oil | OffSetting Derivative Contracts - January through March - Year Two | Price Swaps
Derivatives, Fair Value [Line Items]
Volume (Bbld) | bbl		0
Weighted Average Price		0
Crude Oil | Derivative Contracts - April through June - Year Two | Price Swaps
Derivatives, Fair Value [Line Items]
Volume (Bbld) | bbl		120
Weighted Average Price		67.79
Crude Oil | Offsetting Derivative Contracts - April through June - Year Two | Price Swaps
Derivatives, Fair Value [Line Items]
Volume (Bbld) | bbl		0
Weighted Average Price		0
Crude Oil | Derivative Contracts - July through September - Year Two | Price Swaps
Derivatives, Fair Value [Line Items]
Volume (Bbld) | bbl		100
Weighted Average Price		70.15
Crude Oil | Offsetting Derivative Contracts - July through September - Year Two | Price Swaps
Derivatives, Fair Value [Line Items]
Volume (Bbld) | bbl		0
Weighted Average Price		0
Crude Oil | Derivative Contracts - October through December - Year Two | Price Swaps
Derivatives, Fair Value [Line Items]
Volume (Bbld) | bbl		69
Weighted Average Price		69.41
Crude Oil | Offsetting Derivative Contracts - October through December - Year Two | Price Swaps
Derivatives, Fair Value [Line Items]
Volume (Bbld) | bbl		0
Weighted Average Price		0
Crude Oil | Derivative Contracts - January through April (closed) | Roll Differential Swap
Derivatives, Fair Value [Line Items]
Volume (Bbld) | bbl	[4]	125
Weighted Average Price	[4]	0.15
Crude Oil | Derivative Contracts - May through December | Roll Differential Swap
Derivatives, Fair Value [Line Items]
Volume (Bbld) | bbl	[4]	125
Weighted Average Price	[4]	0.15
Natural Gas | Derivative Contracts - January through March (closed) | Basis Swaps
Derivatives, Fair Value [Line Items]
Volume (MMBtud) | BTU	[5]	210
Weighted Average Price	[5]	(0.01)
Natural Gas | Derivative Contracts - January through April (closed) | Price Swaps
Derivatives, Fair Value [Line Items]
Volume (MMBtud) | BTU		725
Weighted Average Price		3.57
Natural Gas | Derivative Contracts - May through December | Price Swaps
Derivatives, Fair Value [Line Items]
Volume (MMBtud) | BTU		725
Weighted Average Price		3.57
Natural Gas | Derivative Contracts - April through December | Basis Swaps
Derivatives, Fair Value [Line Items]
Volume (MMBtud) | BTU	[5]	210
Weighted Average Price	[5]	(0.01)
Natural Gas | Derivative Contracts - Year Two | Price Swaps
Derivatives, Fair Value [Line Items]
Volume (MMBtud) | BTU		725
Weighted Average Price		3.18
Natural Gas | Derivative Contracts - Year Two | Basis Swaps
Derivatives, Fair Value [Line Items]
Volume (MMBtud) | BTU	[5]	135
Weighted Average Price	[5]	(0.01)
Natural Gas | Derivative Contracts - Year Three | Price Swaps
Derivatives, Fair Value [Line Items]
Volume (MMBtud) | BTU		725
Weighted Average Price		3.07
Natural Gas | Derivative Contracts - Year Three | Basis Swaps
Derivatives, Fair Value [Line Items]
Volume (MMBtud) | BTU	[5]	10
Weighted Average Price	[5]	0.00
Natural Gas | Derivative Contracts - Year Four | Price Swaps
Derivatives, Fair Value [Line Items]
Volume (MMBtud) | BTU		725
Weighted Average Price		3.07
Natural Gas | Derivative Contracts - Year Four | Basis Swaps
Derivatives, Fair Value [Line Items]
Volume (MMBtud) | BTU	[5]	10
Weighted Average Price	[5]	0.00

[1] The noncurrent portion of Assets from Price Risk Management Activities consists of gross assets of $7 million, partially offset by gross liabilities of $1 million, at December 31, 2021.

[2] The current portion of Liabilities from Price Risk Management Activities consists of gross liabilities of $1,948 million, partially offset by gross assets of $13 million and collateral posted with counterparties of $1,675 million at March 31, 2022. The current portion of Liabilities from Price Risk Management Activities consists of gross liabilities of $421 million, partially offset by gross assets of $29 million and collateral posted with counterparties of $123 million, at December 31, 2021.

[3] The noncurrent portion of Liabilities from Price Risk Management Activities consists of gross liabilities of $860 million, partially offset by gross assets of $10 million and collateral posted with counterparties of $740 million at March 31, 2022. The noncurrent portion of Liabilities from Price Risk Management Activities consists of gross liabilities of $64 million, partially offset by gross assets of $10 million and collateral posted with counterparties of $17 million, at December 31, 2021.

[4] This settlement index is used to fix the differential in pricing between the NYMEX calendar month average and the physical crude oil delivery month.

[5] This settlement index is used to fix the differential between pricing at the Houston Ship Channel and NYMEX Henry Hub prices.