Derivative Assets And Liabilities Table - Gross FV and Netting Offset (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 1,034	$ 168
Derivative Liability, Fair Value, Gross Liability	(1,457)	(717)
Counterparty netting	(645)	(44)
Counterparty netting	645	44
Payments on margin deposit	(327)	(64)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	327	64
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	62	60
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	485	609
Without offsetting agreements [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	(376)	(448)
OTC Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	702	53
Derivative Liability, Fair Value, Gross Liability	(661)	(71)
Broker cleared derivative contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	332	115
Derivative Liability, Fair Value, Gross Liability	$ (420)	$ (198)

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