Derivative and Hedging Activities - Derivative Instruments (Details) - Energy related derivative $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($) Bcf MMBbls	Dec. 31, 2021 USD ($) MMBbls Bcf
Derivative [Line Items]
Derivative assets (liabilities), at fair value, net	$ (3,022)	$ (1,143)
Oil
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | MMBbls	32	22
Derivative assets (liabilities), at fair value, net	$ (523)	$ (358)
Oil | Fixed-price swaps
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | MMBbls	10	13
Derivative assets (liabilities), at fair value, net	$ (469)	$ (356)
Oil | Collars
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | MMBbls	5	0
Derivative assets (liabilities), at fair value, net	$ (40)	$ 0
Oil | Basis protection swaps
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | MMBbls	17	9
Derivative assets (liabilities), at fair value, net	$ (14)	$ (2)
Natural Gas
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | Bcf	1,716	1,112
Derivative assets (liabilities), at fair value, net	$ (2,499)	$ (785)
Natural Gas | Fixed-price swaps
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | Bcf	700	637
Derivative assets (liabilities), at fair value, net	$ (1,784)	$ (675)
Natural Gas | Collars
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | Bcf	572	205
Derivative assets (liabilities), at fair value, net	$ (610)	$ (82)
Natural Gas | Three-way collars
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | Bcf	23	0
Derivative assets (liabilities), at fair value, net	$ (47)	$ 0
Natural Gas | Call options
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | Bcf	18	18
Derivative assets (liabilities), at fair value, net	$ (46)	$ (17)
Natural Gas | Swaptions
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | Bcf	7	0
Derivative assets (liabilities), at fair value, net	$ (12)	$ 0
Natural Gas | Basis protection swaps
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | Bcf	396	252
Derivative assets (liabilities), at fair value, net	$ 0	$ (11)