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Loans and Allowance for Loan Losses - Impaired Loans by Class (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Loan impairment    
Impaired Financing Receivable, with Related Allowance, Recorded Investment $ 373 $ 521
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 309 209
Recorded Investment, Impaired loans 682 730
Allowance for impaired loans 55 75
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 423 603
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 415 249
Commercial | Commercial and industrial    
Loan impairment    
Impaired Financing Receivable, with Related Allowance, Recorded Investment 186 299
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 13 22
Recorded Investment, Impaired loans 199 321
Allowance for impaired loans 43 61
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 227 372
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 99 39
Commercial | Commercial mortgage    
Loan impairment    
Impaired Financing Receivable, with Related Allowance, Recorded Investment 7 25
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 168 41
Recorded Investment, Impaired loans 175 66
Allowance for impaired loans 0 1
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 7 25
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 168 41
Consumer | Other Consumer Loans [Member]    
Loan impairment    
Impaired Financing Receivable, with Related Allowance, Recorded Investment 2 1
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0 0
Recorded Investment, Impaired loans 2 1
Allowance for impaired loans 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 2 1
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 0
Consumer | residential mortgage and home equity [Member]    
Loan impairment    
Impaired Financing Receivable, with Related Allowance, Recorded Investment 178 196
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 66 83
Recorded Investment, Impaired loans 244 279
Allowance for impaired loans 12 13
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 187 205
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 86 106
Commercial Portfolio Segment [Member]    
Loan impairment    
Impaired Financing Receivable, with Related Allowance, Recorded Investment 193 324
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 243 126
Recorded Investment, Impaired loans 436 450
Allowance for impaired loans 43 62
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 234 397
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 329 143
Commercial Portfolio Segment [Member] | Construction    
Loan impairment    
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0 0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 62 63
Recorded Investment, Impaired loans 62 63
Allowance for impaired loans 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 62 63
Consumer Portfolio Segment [Member]    
Loan impairment    
Impaired Financing Receivable, with Related Allowance, Recorded Investment 180 197
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 66 83
Recorded Investment, Impaired loans 246 280
Allowance for impaired loans 12 13
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 189 206
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance $ 86 $ 106