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Loans and Allowance for Loan Losses (Details 13) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Loan impairment    
Recorded investment with an allowance $ 622 $ 882
Recorded investment without an allowance 262 140
Impaired loans 884 1,022
Allowance for impaired loans 92 168
Unpaid principal balance with an allowance 702 986
Unpaid principal balance without an allowance 298 182
Commercial portfolio    
Loan impairment    
Recorded investment with an allowance 346 591
Recorded investment without an allowance 177 45
Impaired loans 523 636
Allowance for impaired loans 76 151
Unpaid principal balance with an allowance 409 680
Unpaid principal balance without an allowance 192 63
Commercial portfolio | Commercial and industrial    
Loan impairment    
Recorded investment with an allowance 303 505
Recorded investment without an allowance 113 36
Impaired loans 416 541
Allowance for impaired loans 75 150
Unpaid principal balance with an allowance 365 672
Unpaid principal balance without an allowance 128 54
Commercial portfolio | Commercial mortgage    
Loan impairment    
Recorded investment with an allowance 43 86
Recorded investment without an allowance 3 9
Impaired loans 46 95
Allowance for impaired loans 1 1
Unpaid principal balance with an allowance 44 8
Unpaid principal balance without an allowance 3 9
Commercial portfolio | Construction    
Loan impairment    
Recorded investment with an allowance 0  
Recorded investment without an allowance 61  
Impaired loans 61  
Allowance for impaired loans 0  
Unpaid principal balance with an allowance 0  
Unpaid principal balance without an allowance 61  
Consumer portfolio    
Loan impairment    
Recorded investment with an allowance 276 291
Recorded investment without an allowance 85 95
Impaired loans 361 386
Allowance for impaired loans 16 17
Unpaid principal balance with an allowance 293 306
Unpaid principal balance without an allowance 106 119
Consumer portfolio | Residential mortgage    
Loan impairment    
Recorded investment with an allowance 239 250
Recorded investment without an allowance 67 75
Impaired loans 306 325
Allowance for impaired loans 15 17
Unpaid principal balance with an allowance 256 295
Unpaid principal balance without an allowance 78 89
Consumer portfolio | Home equity and other consumer loans    
Loan impairment    
Recorded investment with an allowance 37 41
Recorded investment without an allowance 18 20
Impaired loans 55 61
Allowance for impaired loans 1 0
Unpaid principal balance with an allowance 37 11
Unpaid principal balance without an allowance $ 28 $ 30