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Loans and Allowance for Loan Losses - Impaired Loans by Class (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Loan impairment    
Recorded investment with an allowance $ 646 $ 570
Recorded investment without an allowance 140 263
Recorded Investment, Impaired loans 786 833
Allowance for impaired loans 164 114
Unpaid principal balance with an allowance 750 602
Unpaid principal balance without an allowance 182 297
Commercial    
Loan impairment    
Recorded investment with an allowance 471 377
Recorded investment without an allowance 45 148
Recorded Investment, Impaired loans   525
Allowance for impaired loans 147 101
Unpaid principal balance with an allowance 560 392
Unpaid principal balance without an allowance 63 153
Commercial | Commercial and industrial    
Loan impairment    
Recorded investment with an allowance 463 363
Recorded investment without an allowance 36 142
Recorded Investment, Impaired loans 499 505
Allowance for impaired loans 146 100
Unpaid principal balance with an allowance 552 377
Unpaid principal balance without an allowance 54 144
Commercial | Commercial mortgage    
Loan impairment    
Recorded investment with an allowance 8 14
Recorded investment without an allowance 9 6
Recorded Investment, Impaired loans 17 20
Allowance for impaired loans 1 1
Unpaid principal balance with an allowance 8 15
Unpaid principal balance without an allowance 9 9
Consumer    
Loan impairment    
Recorded investment with an allowance 174 192
Recorded investment without an allowance 95 115
Recorded Investment, Impaired loans 269 307
Allowance for impaired loans 17 13
Unpaid principal balance with an allowance 189 209
Unpaid principal balance without an allowance 119 144
Consumer | Residential mortgage    
Loan impairment    
Recorded investment with an allowance 164 183
Recorded investment without an allowance 75 93
Recorded Investment, Impaired loans 239 276
Allowance for impaired loans 17 13
Unpaid principal balance with an allowance 178 199
Unpaid principal balance without an allowance 89 109
Consumer | Home equity and other consumer loans    
Loan impairment    
Recorded investment with an allowance 10 9
Recorded investment without an allowance 20 22
Recorded Investment, Impaired loans 30 31
Allowance for impaired loans 0 0
Unpaid principal balance with an allowance 11 10
Unpaid principal balance without an allowance 30 35
Total, excluding purchased credit-impaired loans    
Loan impairment    
Recorded investment with an allowance 645 569
Recorded investment without an allowance 140 263
Recorded Investment, Impaired loans 785 832
Allowance for impaired loans 164 114
Unpaid principal balance with an allowance 749 601
Unpaid principal balance without an allowance 182 297
Purchased Credit- Impaired    
Loan impairment    
Recorded investment with an allowance 1 1
Recorded investment without an allowance 0 0
Recorded Investment, Impaired loans 1 1
Allowance for impaired loans 0 0
Unpaid principal balance with an allowance 1 1
Unpaid principal balance without an allowance $ 0 $ 0