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Loans and Allowance for Loan Losses - Information about Impaired Loans by Class (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Loan impairment    
Recorded investment with an allowance $ 631 $ 882
Recorded investment without an allowance 206 140
Impaired loans 837 1,022
Allowance for impaired loans 107 168
Unpaid principal balance with an allowance 697 986
Unpaid principal balance without an allowance 257 182
Commercial    
Loan impairment    
Recorded investment with an allowance 370 591
Recorded investment without an allowance 125 45
Impaired loans 495 636
Allowance for impaired loans 92 151
Unpaid principal balance with an allowance 420 680
Unpaid principal balance without an allowance 156 63
Commercial | Commercial and industrial    
Loan impairment    
Recorded investment with an allowance 332 505
Recorded investment without an allowance 65 36
Impaired loans 397 541
Allowance for impaired loans 92 150
Unpaid principal balance with an allowance 382 672
Unpaid principal balance without an allowance 95 54
Commercial | Commercial mortgage    
Loan impairment    
Recorded investment with an allowance 38 86
Recorded investment without an allowance 2 9
Impaired loans 40 95
Allowance for impaired loans 0 1
Unpaid principal balance with an allowance 38 8
Unpaid principal balance without an allowance 3 9
Commercial | Construction    
Loan impairment    
Recorded investment with an allowance 0  
Recorded investment without an allowance 58  
Impaired loans 58  
Allowance for impaired loans 0  
Unpaid principal balance with an allowance 0  
Unpaid principal balance without an allowance 58  
Consumer    
Loan impairment    
Recorded investment with an allowance 261 291
Recorded investment without an allowance 81 95
Impaired loans 342 386
Allowance for impaired loans 15 17
Unpaid principal balance with an allowance 277 306
Unpaid principal balance without an allowance 101 119
Consumer | Residential mortgage    
Loan impairment    
Recorded investment with an allowance 229 250
Recorded investment without an allowance 66 75
Impaired loans 295 325
Allowance for impaired loans 15 17
Unpaid principal balance with an allowance 244 295
Unpaid principal balance without an allowance 76 89
Consumer | Home equity and other consumer loans    
Loan impairment    
Recorded investment with an allowance 32 41
Recorded investment without an allowance 15 20
Impaired loans 47 61
Allowance for impaired loans 0 0
Unpaid principal balance with an allowance 33 11
Unpaid principal balance without an allowance $ 25 $ 30