Annual report pursuant to Section 13 and 15(d)

Derivatives - Derivatives Designated as Accounting Hedges - Cash Flow and Net Investment Hedges (Details)

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Derivatives - Derivatives Designated as Accounting Hedges - Cash Flow and Net Investment Hedges (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flow hedges      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Recognized in Accumulated OCI on Derivatives $ 55 $ 195 $ 156
Gains (Losses) in Income Reclassified from Accumulated OCI (883) (760) (773)
Hedge Ineffectiveness and Amounts Excluded from Effectiveness Testing (2) (4) 0
Interest rate risk on variable-rate portfolios | Cash flow hedges      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Recognized in Accumulated OCI on Derivatives 95 68 (321)
Gains (Losses) in Income Reclassified from Accumulated OCI (974) (1,119) (1,102)
Hedge Ineffectiveness and Amounts Excluded from Effectiveness Testing (2) (4) 0
Price risk on restricted stock awards | Cash flow hedges      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Recognized in Accumulated OCI on Derivatives (40) 127 477
Gains (Losses) in Income Reclassified from Accumulated OCI 91 359 329
Hedge Ineffectiveness and Amounts Excluded from Effectiveness Testing 0 0 0
Foreign exchange risk | Net investment hedges      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Recognized in Accumulated OCI on Derivatives 3,010 3,021 1,024
Gains (Losses) in Income Reclassified from Accumulated OCI 153 21 (355)
Hedge Ineffectiveness and Amounts Excluded from Effectiveness Testing $ (298) $ (503) $ (134)