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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, 2020
Dec. 31, 2019
Offsetting Assets [Line Items]    
Derivative Asset, Fair Value, Gross Asset Excluding Accruals $ 11,958 $ 10,195
Derivative Liability, Fair Value, Gross Liability Excluding Accruals 4,171 3,716
Net amount of derivative assets after application of master netting agreements and cash collateral 200 93
Net amount of derivative liabilities after application of master netting agreements and cash collateral 108 25
Over the Counter [Member]    
Offsetting Assets [Line Items]    
Derivative Asset, Fair Value, Gross Asset Excluding Accruals 11,348 9,574
Derivative Liability, Fair Value, Gross Liability Excluding Accruals 4,111 3,624
Gross estimated fair value of derivative assets (2,926) (2,664)
Gross estimated fair value of derivative liabilities (2,926) (2,664)
Cash collateral on derivative assets (6,842) (5,317)
Cash collateral on derivative liabilities 0 0
Securities collateral on derivative assets (1,453) (1,521)
Securities collateral on derivative liabilities (1,100) (935)
Exchange Traded [Member]    
Offsetting Assets [Line Items]    
Derivative Asset, Fair Value, Gross Asset Excluding Accruals 17 15
Derivative Liability, Fair Value, Gross Liability Excluding Accruals 40 11
Gross estimated fair value of derivative assets 0 (2)
Gross estimated fair value of derivative liabilities 0 (2)
Cash collateral on derivative assets 0 0
Cash collateral on derivative liabilities (23) (5)
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities (1) (4)
Cleared [Member]    
Offsetting Assets [Line Items]    
Derivative Asset, Fair Value, Gross Asset Excluding Accruals 593 606
Derivative Liability, Fair Value, Gross Liability Excluding Accruals 20 81
Gross estimated fair value of derivative assets (7) (38)
Gross estimated fair value of derivative liabilities (7) (38)
Cash collateral on derivative assets (530) (560)
Cash collateral on derivative liabilities (5) (4)
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities $ (1) $ (39)