Derivatives and Risk Management (Summary of Before Tax Effect of Cash Flow Hedges on Consolidated Financial Statements) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	$ 2,093	$ 24
Total gain (loss) on settled derivatives	345	(5,283)
Non-performance risk adjustment	(5)	0
Total gain (loss) on derivatives	2,433	(5,259)	$ (2,436)
Fixed price swaps | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	1,281	(166)
Total gain (loss) on settled derivatives	300	(2,918)
Fixed price swaps | Oil
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	22	46
Total gain (loss) on settled derivatives	(27)	(129)
Fixed price swaps | Ethane
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	5	12
Total gain (loss) on settled derivatives	6	(49)
Fixed price swaps | Propane
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	1	87
Total gain (loss) on settled derivatives	26	(100)
Fixed price swaps | Normal Butane
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	0	27
Total gain (loss) on settled derivatives	3	(35)
Fixed price swaps | Natural Gasoline
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	2	34
Total gain (loss) on settled derivatives	1	(49)
Fixed price swaps | Natural gas storage
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	0	1
Total gain (loss) on settled derivatives	0	(3)
Two-way costless collars | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	279	(116)
Total gain (loss) on settled derivatives	48	(448)
Two-way costless collars | Oil
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	2	0
Total gain (loss) on settled derivatives	(1)	0
Two-way costless collars | Ethane
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	0	1
Total gain (loss) on settled derivatives	0	(1)
Three-way costless collars | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	402	117
Total gain (loss) on settled derivatives	(19)	(1,319)
Three-way costless collars | Oil
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	32	11
Total gain (loss) on settled derivatives	(27)	(51)
Three-way costless collars | Propane
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	0	4
Total gain (loss) on settled derivatives	0	(5)
Basis swaps | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	1	(57)
Total gain (loss) on settled derivatives	43	128
Call options | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	70	21
Call options | Natural Gas | Purchased
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on settled derivatives	(8)	(304)
Put options | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	(4)	4
Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	0	(2)
Index Swap | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on settled derivatives	0	(1)
Purchased fixed price swaps | Natural gas storage | Purchased
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on settled derivatives	$ 0	$ 1