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Risk Management - Fair Value of Derivative Contracts (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Derivatives Asset	$ 72	$ 178
Derivatives Liability	(488)	(395)
Energy commodity derivative contracts
Derivatives, Fair Value [Line Items]
Derivatives Asset	48	140
Derivatives Liability	(162)	(113)
Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivatives Asset	24	38
Derivatives Liability	(309)	(278)
Foreign currency contracts
Derivatives, Fair Value [Line Items]
Derivatives Liability	(17)	(4)
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivatives Asset	55	126
Derivatives Liability	(462)	(386)
Derivatives designated as hedging instruments | Energy commodity derivative contracts
Derivatives, Fair Value [Line Items]
Derivatives Asset	31	89
Derivatives Liability	(136)	(104)
Derivatives designated as hedging instruments | Energy commodity derivative contracts | Fair value of derivative contracts - current assets
Derivatives, Fair Value [Line Items]
Derivatives Asset	30	77
Derivatives designated as hedging instruments | Energy commodity derivative contracts | Fair value of derivative contracts - current liabilities
Derivatives, Fair Value [Line Items]
Derivatives Liability	(93)	(75)
Derivatives designated as hedging instruments | Energy commodity derivative contracts | Deferred charges and other assets
Derivatives, Fair Value [Line Items]
Derivatives Asset	1	12
Derivatives designated as hedging instruments | Energy commodity derivative contracts | Other long-term liabilities and deferred credits
Derivatives, Fair Value [Line Items]
Derivatives Liability	(43)	(29)
Derivatives designated as hedging instruments | Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivatives Asset	24	37
Derivatives Liability	(309)	(278)
Derivatives designated as hedging instruments | Interest rate contracts | Fair value of derivative contracts - current assets
Derivatives, Fair Value [Line Items]
Derivatives Asset	0	0
Derivatives designated as hedging instruments | Interest rate contracts | Fair value of derivative contracts - current liabilities
Derivatives, Fair Value [Line Items]
Derivatives Liability	(101)	(120)
Derivatives designated as hedging instruments | Interest rate contracts | Deferred charges and other assets
Derivatives, Fair Value [Line Items]
Derivatives Asset	24	37
Derivatives designated as hedging instruments | Interest rate contracts | Other long-term liabilities and deferred credits
Derivatives, Fair Value [Line Items]
Derivatives Liability	(208)	(158)
Derivatives designated as hedging instruments | Foreign currency contracts
Derivatives, Fair Value [Line Items]
Derivatives Asset	0	0
Derivatives Liability	(17)	(4)
Derivatives designated as hedging instruments | Foreign currency contracts | Fair value of derivative contracts - current assets
Derivatives, Fair Value [Line Items]
Derivatives Asset	0	0
Derivatives designated as hedging instruments | Foreign currency contracts | Fair value of derivative contracts - current liabilities
Derivatives, Fair Value [Line Items]
Derivatives Liability	(9)	(2)
Derivatives designated as hedging instruments | Foreign currency contracts | Deferred charges and other assets
Derivatives, Fair Value [Line Items]
Derivatives Asset	0	0
Derivatives designated as hedging instruments | Foreign currency contracts | Other long-term liabilities and deferred credits
Derivatives, Fair Value [Line Items]
Derivatives Liability	(8)	(2)
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivatives Asset	17	52
Derivatives Liability	(26)	(9)
Derivatives not designated as hedging instruments | Energy commodity derivative contracts | Fair value of derivative contracts - current assets
Derivatives, Fair Value [Line Items]
Derivatives Asset	16	49
Derivatives not designated as hedging instruments | Energy commodity derivative contracts | Fair value of derivative contracts - current liabilities
Derivatives, Fair Value [Line Items]
Derivatives Liability	(25)	(8)
Derivatives not designated as hedging instruments | Energy commodity derivative contracts | Deferred charges and other assets
Derivatives, Fair Value [Line Items]
Derivatives Asset	1	3
Derivatives not designated as hedging instruments | Energy commodity derivative contracts | Other long-term liabilities and deferred credits
Derivatives, Fair Value [Line Items]
Derivatives Liability	$ (1)	$ (1)

X

- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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