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Long-term Debt - Trust and Hybrid Securities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 29, 2015
Debt Instrument [Line Items]        
Net interest income $ (38,958) $ (40,779) $ (40,719)  
Junior subordinated notes (related to trust preferred securities)        
Debt Instrument [Line Items]        
Carrying value 6,781      
Junior subordinated notes (related to trust preferred securities) | Capital Trust III, Capital Trust IV and Capital Trust V        
Debt Instrument [Line Items]        
Carrying value       $ 2,000
Net interest income $ 612