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, 2017
Mar. 31, 2016
Dec. 31, 2016
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis      
Loans held-for-sale, measured at fair value $ 3,745   $ 4,026
Loans and leases, measured at fair value 7,528   7,085
Other assets, measured at fair value 14,639   $ 13,802
Nonrecurring      
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis      
Gains (Losses) on loans held-for-sale (4) $ (21)  
Gains (Losses) on loans and leases (123) (182)  
Gains (Losses) on foreclosed properties (25) (20)  
Gains (Losses) on other assets (86) (18)  
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 1,100 1,400  
Nonrecurring | Level 2      
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis      
Loans held-for-sale, measured at fair value 69 775  
Loans and leases, measured at fair value 0 0  
Foreclosed properties, measured at fair value 0 0  
Other assets, measured at fair value 91 36  
Loss on loans and leases written down to zero 46 42  
Nonrecurring | Level 3      
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis      
Loans held-for-sale, measured at fair value 18 29  
Loans and leases, measured at fair value 438 758  
Foreclosed properties, measured at fair value 82 82  
Other assets, measured at fair value $ 0 $ 0