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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Loans held-for-sale, measured at fair value $ 4,688   $ 4,688   $ 6,801
Loans and leases, measured at fair value 7,178   7,178   8,681
Other assets, measured at fair value 13,318   13,318   $ 13,873
Nonrecurring          
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Gains (Losses) on loans held-for-sale 0 $ (17) (7) $ (6)  
Gains (Losses) on loans and leases (225) (286) (798) (671)  
Gains (Losses) on foreclosed properties (36) (21) (58) (34)  
Gains (Losses) on other assets (4) (1) (8) (2)  
Nonrecurring | Level 2          
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Loans held-for-sale, measured at fair value 10 197 10 197  
Loans and leases, measured at fair value 23 9 23 9  
Foreclosed properties, measured at fair value 0 0 0 0  
Other assets, measured at fair value 39 24 39 24  
Loan loss write-offs $ 72 71 146 233  
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 $ 34 32 34 32  
Loans and leases, measured at fair value 2,363 4,298 2,363 4,298  
Foreclosed properties, measured at fair value 149 210 149 210  
Other assets, measured at fair value 0 0 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 $ 1,300 $ 1,100 $ 1,300 $ 1,100