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, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	$ 24	$ (945)
Settled Gain (Loss) on Derivatives Recognized in Earnings	(5,283)	(1,492)
Non-performance risk adjustment	0	1
Total loss on derivatives	(5,259)	(2,436)	$ 224
Purchased fixed price swaps | Natural Gas | Purchased
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	0	(1)
Settled Gain (Loss) on Derivatives Recognized in Earnings	0	7
Purchased fixed price swaps | Oil | Purchased
Derivative Instruments, Gain (Loss) [Line Items]
Settled Gain (Loss) on Derivatives Recognized in Earnings	0	1
Purchased fixed price swaps | Natural gas storage | Purchased
Derivative Instruments, Gain (Loss) [Line Items]
Settled Gain (Loss) on Derivatives Recognized in Earnings	1	2
Fixed price swaps | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	(166)	(237)
Settled Gain (Loss) on Derivatives Recognized in Earnings	(2,918)	(418)
Fixed price swaps | Oil
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	46	(70)
Settled Gain (Loss) on Derivatives Recognized in Earnings	(129)	(86)
Fixed price swaps | Ethane
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	12	2
Settled Gain (Loss) on Derivatives Recognized in Earnings	(49)	(39)
Fixed price swaps | Propane
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	87	(40)
Settled Gain (Loss) on Derivatives Recognized in Earnings	(100)	(173)
Fixed price swaps | Normal Butane
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	27	(18)
Settled Gain (Loss) on Derivatives Recognized in Earnings	(35)	(53)
Fixed price swaps | Natural Gasoline
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	34	(18)
Settled Gain (Loss) on Derivatives Recognized in Earnings	(49)	(59)
Fixed price swaps | Natural gas storage
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	1	(1)
Settled Gain (Loss) on Derivatives Recognized in Earnings	(3)	(1)
Two-way costless collars | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	(116)	(83)
Settled Gain (Loss) on Derivatives Recognized in Earnings	(448)	(325)
Two-way costless collars | Oil
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	0	1
Settled Gain (Loss) on Derivatives Recognized in Earnings	0	(4)
Two-way costless collars | Ethane
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	1	0
Settled Gain (Loss) on Derivatives Recognized in Earnings	(1)	(2)
Three-way costless collars | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	117	(375)
Settled Gain (Loss) on Derivatives Recognized in Earnings	(1,319)	(335)
Three-way costless collars | Oil
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	11	(41)
Settled Gain (Loss) on Derivatives Recognized in Earnings	(51)	(29)
Three-way costless collars | Propane
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	4	(4)
Settled Gain (Loss) on Derivatives Recognized in Earnings	(5)	0
Index Swap | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Settled Gain (Loss) on Derivatives Recognized in Earnings	(1)	0
Basis swaps | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	(57)	3
Settled Gain (Loss) on Derivatives Recognized in Earnings	128	92
Call options | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	21	(68)
Call options | Natural Gas | Purchased
Derivative Instruments, Gain (Loss) [Line Items]
Settled Gain (Loss) on Derivatives Recognized in Earnings	(304)	(66)
Call options | Oil | Purchased
Derivative Instruments, Gain (Loss) [Line Items]
Settled Gain (Loss) on Derivatives Recognized in Earnings	0	(2)
Put options | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	4	1
Settled Gain (Loss) on Derivatives Recognized in Earnings	0	(2)
Amortization of premium paid		2
Swaptions | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	0	2
Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Unsettled Gain (Loss) on Derivatives Recognized in Earnings	$ (2)	$ 2