Derivative Assets And Liabilities Table - Gross FV and Netting Offset (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 147	$ 384
Derivative Liability, Fair Value, Gross Liability	(726)	(788)
Counterparty netting	(28)	(18)
Counterparty netting	28	18
Payments on margin deposit	(34)	(318)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	34	318
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	85	48
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	664	452
Without offsetting agreements [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	(522)	(399)
OTC Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	47	41
Derivative Liability, Fair Value, Gross Liability	(45)	(39)
Broker cleared derivative contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	100	343
Derivative Liability, Fair Value, Gross Liability	$ (159)	$ (350)

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