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Derivatives (Estimated Fair Value of Derivative Assets and Liabilities after Master Netting Agreements and Cash Collateral) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets $ 7,374 $ 8,626
Gross estimated fair value of derivative liabilities 4,479 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 7,374 8,626
Estimated fair value of derivative liabilities presented in the consolidated balance sheets 4,479 4,290
Net amount of derivative assets after application of master netting agreements and cash collateral 124 305
Net amount of derivative liabilities after application of master netting agreements and cash collateral 55 57
Over the Counter [Member]    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 7,175 7,955
Gross estimated fair value of derivative liabilities 4,387 4,059
Gross estimated fair value of derivative assets (2,809) (2,528)
Gross estimated fair value of derivative liabilities (2,809) (2,528)
Cash collateral on derivative assets (3,189) (4,169)
Cash collateral on derivative liabilities (149) 0
Securities collateral on derivative assets (1,072) (1,004)
Securities collateral on derivative liabilities (1,368) (1,474)
Cleared [Member]    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 190 649
Gross estimated fair value of derivative liabilities 78 223
Gross estimated fair value of derivative assets (7) (35)
Gross estimated fair value of derivative liabilities (7) (35)
Cash collateral on derivative assets (172) (584)
Cash collateral on derivative liabilities (50) (179)
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities (27) (9)
Exchange-traded    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 9 22
Gross estimated fair value of derivative liabilities 14 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 (8) (5)
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities $ (5) $ (2)