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Derivatives (Estimated Fair Value of Derivative Assets and Liabilities after Master Netting Agreements and Cash Collateral) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Offsetting Assets [Line Items]    
Derivative Asset, Fair Value, Gross Asset Excluding Accruals $ 10,195 $ 9,068
Derivative Liability, Fair Value, Gross Liability Excluding Accruals 3,716 3,871
Net amount of derivative assets after application of master netting agreements and cash collateral 93 352
Net amount of derivative liabilities after application of master netting agreements and cash collateral 25 69
Over the Counter [Member]    
Offsetting Assets [Line Items]    
Derivative Asset, Fair Value, Gross Asset Excluding Accruals 9,574 8,805
Derivative Liability, Fair Value, Gross Liability Excluding Accruals 3,624 3,758
Gross estimated fair value of derivative assets (2,664) (2,570)
Gross estimated fair value of derivative liabilities (2,664) (2,570)
Cash collateral on derivative assets (5,317) (4,709)
Cash collateral on derivative liabilities 0 0
Securities collateral on derivative assets (1,521) (1,266)
Securities collateral on derivative liabilities (935) (1,134)
Exchange Traded [Member]    
Offsetting Assets [Line Items]    
Derivative Asset, Fair Value, Gross Asset Excluding Accruals 15 18
Derivative Liability, Fair Value, Gross Liability Excluding Accruals 11 80
Gross estimated fair value of derivative assets (2) (1)
Gross estimated fair value of derivative liabilities (2) (1)
Cash collateral on derivative assets 0 0
Cash collateral on derivative liabilities (5) (57)
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities (4) (7)
Cleared [Member]    
Offsetting Assets [Line Items]    
Derivative Asset, Fair Value, Gross Asset Excluding Accruals 606 245
Derivative Liability, Fair Value, Gross Liability Excluding Accruals 81 33
Gross estimated fair value of derivative assets (38) (25)
Gross estimated fair value of derivative liabilities (38) (25)
Cash collateral on derivative assets (560) (145)
Cash collateral on derivative liabilities (4) 0
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities $ (39) $ (8)