Derivatives and Risk Management (Summary of Before Tax Effect of Fair Value Hedges not Designated for Hedge Accounting) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on unsettled derivatives	$ (12)	$ (2,015)	$ (2,531)	$ (2,957)
Total loss on settled derivatives	(1,889)	(388)	(4,185)	(509)
Non-performance risk adjustment	(2)	4	7	5
Total loss on derivatives	(1,903)	(2,399)	(6,709)	(3,461)
Fixed price swaps | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on unsettled derivatives	(140)	(748)	(1,654)	(991)
Total loss on settled derivatives	(1,082)	(111)	(2,249)	(112)
Fixed price swaps | Oil
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on unsettled derivatives	73	0	39	(81)
Total loss on settled derivatives	(30)	(18)	(104)	(63)
Fixed price swaps | Ethane
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on unsettled derivatives	24	(12)	(3)	(25)
Total loss on settled derivatives	(15)	(13)	(42)	(23)
Fixed price swaps | Propane
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on unsettled derivatives	67	(32)	74	(120)
Total loss on settled derivatives	(21)	(53)	(96)	(113)
Fixed price swaps | Normal Butane
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on unsettled derivatives	24	(7)	24	(41)
Total loss on settled derivatives	(7)	(17)	(33)	(33)
Fixed price swaps | Natural Gasoline
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on unsettled derivatives	28	1	29	(30)
Total loss on settled derivatives	(9)	(16)	(45)	(38)
Two-way costless collars | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on unsettled derivatives	(99)	(358)	(432)	(518)
Total loss on settled derivatives	(152)	(79)	(386)	(79)
Two-way costless collars | Oil
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on unsettled derivatives	0	1	0	0
Total loss on settled derivatives	0	(1)	0	(3)
Two-way costless collars | Ethane
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on unsettled derivatives	0	(1)	1	(2)
Total loss on settled derivatives	0	(1)	(1)	(1)
Two-way costless collars | Propane
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on unsettled derivatives	0	0	0	0
Three-way costless collars | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on unsettled derivatives	(26)	(619)	(520)	(869)
Total loss on settled derivatives	(491)	(84)	(1,008)	(91)
Three-way costless collars | Oil
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on unsettled derivatives	38	0	10	(47)
Total loss on settled derivatives	(12)	(10)	(43)	(16)
Three-way costless collars | Propane
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on unsettled derivatives	3	(3)	4	(5)
Total loss on settled derivatives	(1)	0	(4)	0
Basis swaps | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on unsettled derivatives	4	(70)	12	(23)
Total loss on settled derivatives	40	27	64	76
Call options | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on unsettled derivatives	(8)	(143)	(114)	(180)
Total loss on settled derivatives	(109)	(16)	(235)	(16)
Call options | Oil
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on unsettled derivatives	0	0	0	(1)
Total loss on settled derivatives	0	(1)	0	(1)
Put options | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on unsettled derivatives	0	0	0	1
Total loss on settled derivatives	0	0	0	(2)
Amortization of premium paid				2
Swaptions | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on unsettled derivatives	0	(21)	0	(24)
Purchased fixed price swaps | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on unsettled derivatives	0	(1)	0	1
Total loss on settled derivatives	0	4	0	5
Purchased fixed price swaps | Natural Gas | Purchased Puts
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on settled derivatives	0	1	1	1
Purchased fixed price swaps | Natural Gas Storage
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on unsettled derivatives	0	1	0	2
Fixed price swaps – storage | Natural Gas Storage
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on unsettled derivatives	0	(3)	1	(5)
Total loss on settled derivatives	0	0	(3)	0
Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on unsettled derivatives	0	0	(2)	1
Index swap | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Total loss on settled derivatives	$ 0	$ 0	$ (1)	$ 0