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Derivative Assets And Liabilities Table - Gross FV and Netting Offset (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset $ 700 $ 384
Derivative Liability, Fair Value, Gross Liability (1,204) (788)
Counterparty netting (49) (18)
Counterparty netting 49 18
Payments on margin deposit (551) (318)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 551 318
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 100 48
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 604 452
Without offsetting agreements [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 0
Derivative Liability, Fair Value, Gross Liability (573) (399)
OTC Contracts [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 74 41
Derivative Liability, Fair Value, Gross Liability (58) (39)
Broker cleared derivative contracts [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 626 343
Derivative Liability, Fair Value, Gross Liability $ (573) $ (350)