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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Loans held-for-sale, measured at fair value $ 4,924   $ 4,924   $ 6,801
Loans and leases, measured at fair value 7,629   7,629   8,681
Other assets, measured at fair value 14,545   14,545   $ 13,873
Nonrecurring          
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Gains (Losses) on loans held-for-sale (4) $ 5 (4) $ 4  
Gains (Losses) on loans and leases (371) (318) (702) (564)  
Gains (Losses) on foreclosed properties (38) (21) (50) (28)  
Gains (Losses) on other assets (4) (16) (4) (16)  
Nonrecurring | Level 2          
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Loans held-for-sale, measured at fair value 19 1,057 19 1,057  
Loans and leases, measured at fair value 21 5 21 5  
Foreclosed properties, measured at fair value 0 6 0 6  
Other assets, measured at fair value 27 90 27 90  
Loan loss write-offs $ 106 113 151 203  
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 $ 26 127 26 127  
Loans and leases, measured at fair value 2,076 3,244 2,076 3,244  
Foreclosed properties, measured at fair value 188 187 188 187  
Other assets, measured at fair value 0 2 0 2  
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 $ 1,300 $ 1,100 $ 1,300 $ 1,100