Derivative Assets And Liabilities Table - Gross FV and Netting Offset (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 502	$ 272
Derivative Liability, Fair Value, Gross Liability	(784)	(598)
Payments on margin deposit	(38)	0
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	38	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	75	79
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	357	405
Derivative assets (liabilities)
Derivatives, Fair Value [Line Items]
Counterparty netting	(389)	(43)
Counterparty netting	389	43
Other current assets (liabilities)
Derivatives, Fair Value [Line Items]
Counterparty netting	0	(150)
Counterparty netting	0	150
Without offsetting agreements [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	(273)	(387)
OTC Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	79	53
Derivative Liability, Fair Value, Gross Liability	(39)	(52)
Broker cleared derivative contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	423	219
Derivative Liability, Fair Value, Gross Liability	$ (472)	$ (159)

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