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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, 2018
Dec. 31, 2017
Offsetting Assets [Line Items]    
Derivative Asset, Fair Value, Gross Asset Excluding Accruals $ 9,068 $ 8,626
Derivative Liability, Fair Value, Gross Liability Excluding Accruals 3,871 4,290
Amounts offset in the consolidated balance sheet, Assets 0 0
Amounts offset in the consolidated balance sheet, Liabilities 0 0
Estimated fair value of derivative assets presented in the consolidated balance sheets 9,068 8,626
Estimated fair value of derivative liabilities presented in the consolidated balance sheets 3,871 4,290
Net amount of derivative assets after application of master netting agreements and cash collateral 352 305
Net amount of derivative liabilities after application of master netting agreements and cash collateral 69 57
Over the Counter [Member]    
Offsetting Assets [Line Items]    
Derivative Asset, Fair Value, Gross Asset Excluding Accruals 8,805 7,955
Derivative Liability, Fair Value, Gross Liability Excluding Accruals 3,758 4,059
Gross estimated fair value of derivative assets (2,570) (2,528)
Gross estimated fair value of derivative liabilities (2,570) (2,528)
Cash collateral on derivative assets (4,709) (4,169)
Cash collateral on derivative liabilities 0 0
Securities collateral on derivative assets (1,266) (1,004)
Securities collateral on derivative liabilities (1,134) (1,474)
Exchange Traded [Member]    
Offsetting Assets [Line Items]    
Derivative Asset, Fair Value, Gross Asset Excluding Accruals 18 22
Derivative Liability, Fair Value, Gross Liability Excluding Accruals 80 8
Gross estimated fair value of derivative assets (1) (1)
Gross estimated fair value of derivative liabilities (1) (1)
Cash collateral on derivative assets 0 0
Cash collateral on derivative liabilities (57) (5)
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities (7) (2)
Cleared [Member]    
Offsetting Assets [Line Items]    
Derivative Asset, Fair Value, Gross Asset Excluding Accruals 245 649
Derivative Liability, Fair Value, Gross Liability Excluding Accruals 33 223
Gross estimated fair value of derivative assets (25) (35)
Gross estimated fair value of derivative liabilities (25) (35)
Cash collateral on derivative assets (145) (584)
Cash collateral on derivative liabilities 0 (179)
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities $ (8) $ (9)