Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Nonrecurring Fair Value (Details)

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Fair Value Measurements - Nonrecurring Fair Value (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis      
Loans held-for-sale, measured at fair value $ 3,303   $ 4,818
Loans and leases, measured at fair value 8,212   6,938
Other assets, measured at fair value 13,293   $ 14,320
Nonrecurring      
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis      
Gains (Losses) on loans held-for-sale (21) $ (33)  
Gains (Losses) on loans and leases (182) (418)  
Gains (Losses) on foreclosed properties (20) (15)  
Gains (Losses) on other assets (18) (1)  
Nonrecurring | Level 2      
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis      
Loans held-for-sale, measured at fair value 775 565  
Loans and leases, measured at fair value 0 5  
Foreclosed properties, measured at fair value 0 0  
Other assets, measured at fair value 36 200  
Loan loss write-offs $ 42 98  
Period of gain/(loss) after transfer of loan to a foreclosed properties 90 days    
Nonrecurring | Level 3      
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis      
Loans held-for-sale, measured at fair value $ 29 22  
Loans and leases, measured at fair value 758 1,391  
Foreclosed properties, measured at fair value 82 400  
Other assets, measured at fair value 0 0  
Government Guaranteed Mortgage Loans upon Foreclosure Receivable | Nonrecurring      
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis      
Foreclosed properties, measured at fair value $ 1,400 $ 1,200