Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Nonrecurring Fair Value (Details)

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Fair Value Measurements - Nonrecurring Fair Value (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis      
Loans held-for-sale, measured at fair value $ 2,156 $ 4,026  
Loans and leases, measured at fair value 5,710 7,085  
Other assets, measured at fair value 20,279 13,802  
Nonrecurring      
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis      
Gains (Losses) on loans held-for-sale (6) (54) $ (8)
Gains (Losses) on loans and leases (336) (458) (993)
Gains (Losses) on foreclosed properties (41) (41) (57)
Gains (Losses) on other assets (124) (74) (28)
Loss on loans and leases written down to zero 135 150 $ 174
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 801 1,200  
Nonrecurring | Level 2      
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis      
Loans held-for-sale, measured at fair value 0 193  
Loans and leases, measured at fair value 0 0  
Foreclosed properties, measured at fair value 0 0  
Other assets, measured at fair value 425 358  
Nonrecurring | Level 3      
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis      
Loans held-for-sale, measured at fair value 2 44  
Loans and leases, measured at fair value 894 1,416  
Foreclosed properties, measured at fair value 83 77  
Other assets, measured at fair value $ 0 $ 0