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Financial Instruments (Notional Amount of Derivatives) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Notional Disclosures [Abstract]    
Derivative assets $ 4,332 $ 5,467
Derivative liabilities (3,717) (4,883)
Accrued Interest 352 792
Cash collateral assets (934) (672)
Derivative Net 33 703
Securities held as collateral (323) (442)
Net carrying amount (291) $ 262
Derivative, Notional Amount $ 161