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Derivative Assets And Liabilities Table - Gross FV and Netting Offset (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset $ 455 $ 384
Derivative Liability, Fair Value, Gross Liability (1,043) (788)
Counterparty netting (53) (18)
Counterparty netting 53 18
Payments on margin deposit (349) (318)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 349 318
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 53 48
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 641 452
Without offsetting agreements [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 0
Derivative Liability, Fair Value, Gross Liability (577) (399)
OTC Contracts [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 67 41
Derivative Liability, Fair Value, Gross Liability (77) (39)
Broker cleared derivative contracts [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 388 343
Derivative Liability, Fair Value, Gross Liability $ (389) $ (350)