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Risk Management - Fair Value of Derivative Contracts (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 178	$ 299
Liability derivatives	(395)	(868)
Energy commodity derivative contracts
Derivatives, Fair Value [Line Items]
Asset derivatives	140	259
Liability derivatives	(113)	(428)
Foreign currency contracts
Derivatives, Fair Value [Line Items]
Liability derivatives	(4)	(35)
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset derivatives	126	195
Liability derivatives	(386)	(687)
Designated as Hedging Instrument | Energy commodity derivative contracts
Derivatives, Fair Value [Line Items]
Asset derivatives	89	156
Liability derivatives	(104)	(247)
Designated as Hedging Instrument | Energy commodity derivative contracts | Fair Value of Derivative Contracts
Derivatives, Fair Value [Line Items]
Asset derivatives	77	150
Designated as Hedging Instrument | Energy commodity derivative contracts | (Fair Value of Derivative Contracts)
Derivatives, Fair Value [Line Items]
Liability derivatives	(75)	(156)
Designated as Hedging Instrument | Energy commodity derivative contracts | Deferred Charges and Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	12	6
Designated as Hedging Instrument | Energy commodity derivative contracts | (Other Long-Term Liabilities and Deferred Credits)
Derivatives, Fair Value [Line Items]
Liability derivatives	(29)	(91)
Designated as Hedging Instrument | Interest rate contracts
Derivatives, Fair Value [Line Items]
Asset derivatives	37	39
Liability derivatives	(278)	(405)
Designated as Hedging Instrument | Interest rate contracts | Fair Value of Derivative Contracts
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0
Designated as Hedging Instrument | Interest rate contracts | (Fair Value of Derivative Contracts)
Derivatives, Fair Value [Line Items]
Liability derivatives	(120)	(144)
Designated as Hedging Instrument | Interest rate contracts | Deferred Charges and Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	37	39
Designated as Hedging Instrument | Interest rate contracts | (Other Long-Term Liabilities and Deferred Credits)
Derivatives, Fair Value [Line Items]
Liability derivatives	(158)	(261)
Designated as Hedging Instrument | Foreign currency contracts
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0
Liability derivatives	(4)	(35)
Designated as Hedging Instrument | Foreign currency contracts | Fair Value of Derivative Contracts
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0
Designated as Hedging Instrument | Foreign currency contracts | (Fair Value of Derivative Contracts)
Derivatives, Fair Value [Line Items]
Liability derivatives	(2)	(3)
Designated as Hedging Instrument | Foreign currency contracts | Deferred Charges and Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0
Designated as Hedging Instrument | Foreign currency contracts | (Other Long-Term Liabilities and Deferred Credits)
Derivatives, Fair Value [Line Items]
Liability derivatives	(2)	(32)
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset derivatives	52	104
Liability derivatives	(9)	(181)
Not Designated as Hedging Instrument | Energy commodity derivative contracts
Derivatives, Fair Value [Line Items]
Asset derivatives	52	103
Liability derivatives	(9)	(181)
Not Designated as Hedging Instrument | Energy commodity derivative contracts | Fair Value of Derivative Contracts
Derivatives, Fair Value [Line Items]
Asset derivatives	49	80
Not Designated as Hedging Instrument | Energy commodity derivative contracts | (Fair Value of Derivative Contracts)
Derivatives, Fair Value [Line Items]
Liability derivatives	(8)	(162)
Not Designated as Hedging Instrument | Energy commodity derivative contracts | Deferred Charges and Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	3	23
Not Designated as Hedging Instrument | Energy commodity derivative contracts | (Other Long-Term Liabilities and Deferred Credits)
Derivatives, Fair Value [Line Items]
Liability derivatives	(1)	(19)
Not Designated as Hedging Instrument | Interest rate contracts | Fair Value of Derivative Contracts
Derivatives, Fair Value [Line Items]
Asset derivatives	0	1
Not Designated as Hedging Instrument | Interest rate contracts | (Fair Value of Derivative Contracts)
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 0	$ 0

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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Fair value, before effects of master netting arrangements, of a financial liability or 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 liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

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-Topic 210
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