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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, 2017
Dec. 31, 2016
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets $ 8,865 $ 12,284
Gross estimated fair value of derivative liabilities 4,625 6,878
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 8,865 12,284
Estimated fair value of derivative liabilities presented in the consolidated balance sheets 4,625 6,878
Net amount of derivative assets after application of master netting agreements and cash collateral 120 370
Net amount of derivative liabilities after application of master netting agreements and cash collateral 109 38
Over the Counter [Member]    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 8,227 9,976
Gross estimated fair value of derivative liabilities 4,346 5,721
Gross estimated fair value of derivative assets (2,654) (3,787)
Gross estimated fair value of derivative liabilities (2,654) (3,787)
Cash collateral on derivative assets (4,351) (4,244)
Cash collateral on derivative liabilities 0 (84)
Securities collateral on derivative assets (1,129) (1,640)
Securities collateral on derivative liabilities (1,583) (1,818)
Cleared [Member]    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 621 2,275
Gross estimated fair value of derivative liabilities 248 1,142
Gross estimated fair value of derivative assets (60) (903)
Gross estimated fair value of derivative liabilities (60) (903)
Cash collateral on derivative assets (541) (1,335)
Cash collateral on derivative liabilities (183) (234)
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities (5) 0
Exchange-traded    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 17 33
Gross estimated fair value of derivative liabilities 31 15
Gross estimated fair value of derivative assets (10) (5)
Gross estimated fair value of derivative liabilities (10) (5)
Cash collateral on derivative assets 0 0
Cash collateral on derivative liabilities (13) (9)
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities $ (8) $ 0