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		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on unsettled derivatives	$ 107	$ 718	$ 1,635	$ (2,519)
Total gain (loss) on settled derivatives	210	(1,601)	87	(2,296)
Non-performance risk adjustment	0	4	(4)	9
Total gain (loss) on derivatives	317	(879)	1,718	(4,806)
Fixed price swaps | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on unsettled derivatives	(24)	339	937	(1,514)
Total gain (loss) on settled derivatives	160	(870)	115	(1,167)
Fixed price swaps | Oil
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on unsettled derivatives	10	19	22	(34)
Total gain (loss) on settled derivatives	(3)	(41)	(7)	(74)
Fixed price swaps | Ethane
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on unsettled derivatives	(9)	(6)	0	(27)
Total gain (loss) on settled derivatives	5	(19)	6	(27)
Fixed price swaps | Propane
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on unsettled derivatives	28	56	29	7
Total gain (loss) on settled derivatives	11	(34)	12	(75)
Fixed price swaps | Normal Butane
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on unsettled derivatives	6	20	7	0
Total gain (loss) on settled derivatives	1	(12)	1	(26)
Fixed price swaps | Natural Gasoline
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on unsettled derivatives	6	29	7	1
Total gain (loss) on settled derivatives	1	(17)	1	(36)
Two-way costless collars | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on unsettled derivatives	(11)	9	230	(333)
Total gain (loss) on settled derivatives	31	(130)	31	(234)
Two-way costless collars | Oil
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on unsettled derivatives			1	0
Two-way costless collars | Ethane
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on unsettled derivatives	0	0	0	1
Total gain (loss) on settled derivatives	0	0	0	(1)
Three-way costless collars | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on unsettled derivatives	27	230	290	(494)
Total gain (loss) on settled derivatives	17	(396)	(16)	(517)
Three-way costless collars | Oil
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on unsettled derivatives	9	5	21	(28)
Total gain (loss) on settled derivatives	(6)	(18)	(13)	(31)
Three-way costless collars | Propane
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on unsettled derivatives	0	3	0	1
Total gain (loss) on settled derivatives	0	(1)	0	(3)
Basis swaps | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on unsettled derivatives	98	(28)	68	8
Total gain (loss) on settled derivatives	(7)	23	(36)	24
Index swap | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on settled derivatives	0	0	0	(1)
Call options | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on unsettled derivatives	(34)	43	27	(106)
Total gain (loss) on settled derivatives	0	(87)	(7)	(126)
Put options | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on unsettled derivatives	0	0	(4)	0
Purchased fixed price swaps | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on settled derivatives	0	1	0	1
Purchased fixed price swaps | Natural Gas Storage
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on unsettled derivatives	0	(1)	0	0
Fixed price swaps – storage | Natural Gas Storage
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on unsettled derivatives	0	0	0	1
Total gain (loss) on settled derivatives	0	0	0	(3)
Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on unsettled derivatives	$ 0	$ 0	$ 0	$ (2)