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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Loans held-for-sale, measured at fair value $ 5,112   $ 5,112   $ 4,818
Loans and leases, measured at fair value 8,660   8,660   6,938
Other assets, measured at fair value 13,885   13,885   $ 14,320
Nonrecurring          
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Gains (Losses) on loans held-for-sale (7) $ (4) (12) $ (4)  
Gains (Losses) on loans and leases (183) (371) (322) (702)  
Gains (Losses) on foreclosed properties (28) (38) (37) (50)  
Gains (Losses) on other assets (34) (17) (47) (17)  
Nonrecurring | Government Guaranteed Mortgage Loans upon Foreclosure Receivable          
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Foreclosed properties, measured at fair value 1,300 1,300 1,300 1,300  
Nonrecurring | Level 2          
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Loans held-for-sale, measured at fair value 588 19 588 19  
Loans and leases, measured at fair value 0 21 0 21  
Foreclosed properties, measured at fair value 2 0 2 0  
Other assets, measured at fair value 142 70 142 70  
Loan loss write-offs 56 106 $ 86 151  
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 49 26 $ 49 26  
Loans and leases, measured at fair value 1,128 2,076 1,128 2,076  
Foreclosed properties, measured at fair value 119 188 119 188  
Other assets, measured at fair value $ 0 $ 0 $ 0 $ 0