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Derivative Assets And Liabilities Table - Gross FV and Netting Offset (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 266	$ 168
Derivative Liability, Fair Value, Gross Liability	(578)	(717)
Counterparty netting	(146)	(44)
Counterparty netting	146	44
Payments on margin deposit	(92)	(64)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	92	64
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	28	60
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	340	609
Without offsetting agreements [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	(254)	(448)
OTC Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	162	53
Derivative Liability, Fair Value, Gross Liability	(148)	(71)
Broker cleared derivative contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	104	115
Derivative Liability, Fair Value, Gross Liability	$ (176)	$ (198)

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