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Changes in Accumulated Other Comprehensive (Loss) Income (Details 1) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other non-interest revenue $ 501 $ 537
Interest expense on long-term debt and other 345 405
Other expenses 1,549 1,611
Net Unrealized Investment Gains (Losses) on Investment Securities [Member]
    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassification for realized (gains) / losses into earnings (29) (23)
Foreign Currency Translation Adjustments [Member]
    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassification for realized (gains) / losses into earnings 1  
Accumulated Other Comprehensive (Loss) Income [Member]
    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassification for realized (gains) / losses into earnings (28) (23)
Reclassification out of accumulated other comprehensive income [Member] | Net Unrealized Investment Gains (Losses) on Investment Securities [Member]
    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other non-interest revenue (45) (36)
Income tax provision for other non-interest revenue 16 13
Other non-interest revenue, net of taxes (29) (23)
Reclassification out of accumulated other comprehensive income [Member] | Foreign Currency Translation Adjustments [Member]
    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other expenses 2 0
Income tax benefit for other, net expense (1) 0
Other, net expense, net of taxes $ 1 $ 0