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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, 2021
Dec. 31, 2020
Offsetting Assets [Line Items]    
Derivative Asset, Fair Value, Gross Asset Excluding Accruals $ 10,596 $ 11,958
Derivative Liability, Fair Value, Gross Liability Excluding Accruals 3,829 4,171
Net amount of derivative assets after application of master netting agreements and cash collateral 124 200
Net amount of derivative liabilities after application of master netting agreements and cash collateral 121 108
Over the Counter [Member]    
Offsetting Assets [Line Items]    
Derivative Asset, Fair Value, Gross Asset Excluding Accruals 10,132 11,348
Derivative Liability, Fair Value, Gross Liability Excluding Accruals 3,798 4,111
Gross estimated fair value of derivative assets (2,204) (2,926)
Gross estimated fair value of derivative liabilities (2,204) (2,926)
Cash collateral on derivative assets (6,948) (6,842)
Cash collateral on derivative liabilities 0 0
Securities collateral on derivative assets (891) (1,453)
Securities collateral on derivative liabilities (1,473) (1,100)
Exchange Traded [Member]    
Offsetting Assets [Line Items]    
Derivative Asset, Fair Value, Gross Asset Excluding Accruals 16 17
Derivative Liability, Fair Value, Gross Liability Excluding Accruals 7 40
Gross estimated fair value of derivative assets (2) 0
Gross estimated fair value of derivative liabilities (2) 0
Cash collateral on derivative assets 0 0
Cash collateral on derivative liabilities (3) (23)
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities (2) (1)
Cleared [Member]    
Offsetting Assets [Line Items]    
Derivative Asset, Fair Value, Gross Asset Excluding Accruals 448 593
Derivative Liability, Fair Value, Gross Liability Excluding Accruals 24 20
Gross estimated fair value of derivative assets (6) (7)
Gross estimated fair value of derivative liabilities (6) (7)
Cash collateral on derivative assets (421) (530)
Cash collateral on derivative liabilities (13) (5)
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities $ (5) $ (1)