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Loans and Allowance for Loan Losses (Details 13) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Loan impairment    
Recorded investment with an allowance $ 367 $ 330
Recorded investment without an allowance 182 173
Impaired loans 549 503
Allowance for impaired loans 41 34
Unpaid principal balance with an allowance 404 377
Unpaid principal balance without an allowance 221 208
Commercial portfolio    
Loan impairment    
Recorded investment with an allowance 173 126
Recorded investment without an allowance 58 38
Impaired loans 231 164
Allowance for impaired loans 25 18
Unpaid principal balance with an allowance 195 159
Unpaid principal balance without an allowance 67 42
Commercial portfolio | Commercial and industrial    
Loan impairment    
Recorded investment with an allowance 154 89
Recorded investment without an allowance 52 35
Impaired loans 206 124
Allowance for impaired loans 24 14
Unpaid principal balance with an allowance 166 120
Unpaid principal balance without an allowance 67 39
Commercial portfolio | Commercial mortgage    
Loan impairment    
Recorded investment with an allowance 19 37
Recorded investment without an allowance 6 3
Impaired loans 25 40
Allowance for impaired loans 1 4
Unpaid principal balance with an allowance 29 39
Unpaid principal balance without an allowance 0 3
Consumer portfolio    
Loan impairment    
Recorded investment with an allowance 194 204
Recorded investment without an allowance 123 134
Impaired loans 317 338
Allowance for impaired loans 16 16
Unpaid principal balance with an allowance 208 218
Unpaid principal balance without an allowance 152 164
Consumer portfolio | Residential mortgage    
Loan impairment    
Recorded investment with an allowance 188 198
Recorded investment without an allowance 101 110
Impaired loans 289 308
Allowance for impaired loans 15 16
Unpaid principal balance with an allowance 200 211
Unpaid principal balance without an allowance 117 127
Consumer portfolio | Home equity and other consumer loans    
Loan impairment    
Recorded investment with an allowance 6 6
Recorded investment without an allowance 22 24
Impaired loans 28 30
Allowance for impaired loans 1 0
Unpaid principal balance with an allowance 8 7
Unpaid principal balance without an allowance 35 37
Total, excluding purchased credit impaired loans    
Loan impairment    
Recorded investment with an allowance 367 330
Recorded investment without an allowance 181 172
Impaired loans 548 502
Allowance for impaired loans 41 34
Unpaid principal balance with an allowance 403 377
Unpaid principal balance without an allowance 219 206
Purchased credit-impaired loans    
Loan impairment    
Recorded investment with an allowance 0 0
Recorded investment without an allowance 1 1
Impaired loans 1 1
Allowance for impaired loans 0 0
Unpaid principal balance with an allowance 1 0
Unpaid principal balance without an allowance $ 2 $ 2