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Changes in Accumulated Other Comprehensive Income (Details 1) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other non-interest revenue $ 2,033 $ 2,989 $ 2,274
Interest Expense, Long-term Debt 1,148 1,334 1,516
Other expense (6,793) (6,089) $ (6,796)
Net Unrealized Investment Gains (Losses) on Investment Securities [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other non-interest revenue 1 111  
Income tax provision for other non-interest revenue 0 (40)  
Increase (decrease) due to amounts reclassified into earnings 1 71  
Foreign Currency Translation Adjustments [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other expense 1 (9)  
Income tax benefit for other, net expense 0 4  
Increase (decrease) due to amounts reclassified into earnings 1 (5)  
Accumulated Other Comprehensive Income (Loss) [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Increase (decrease) due to amounts reclassified into earnings $ 2 $ 66