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Credit Quality - Summary of the ALLL and Related Loans and Leases Classified by Portfolio Segment (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment $ 157   $ 141      
Collectively evaluated for impairment 846   852      
Unallocated 112   110      
Total allowance for loan and lease losses 1,115 $ 1,115 1,103 $ 1,077 $ 1,138 $ 1,196
Individually evaluated for impairment 1,440   1,291      
Collectively evaluated for impairment 106,914   93,795      
Purchased credit impaired 737          
Total portfolio loans and leases 109,091   95,086      
Commercial Portfolio Segment            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 63   42      
Collectively evaluated for impairment 588   603      
Unallocated 0   0      
Total allowance for loan and lease losses 651 654 645 654 713 753
Individually evaluated for impairment 426   277      
Collectively evaluated for impairment 69,662   59,294      
Purchased credit impaired 674          
Total portfolio loans and leases 70,762   59,571      
Residential Mortgage Loans            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 59   61      
Collectively evaluated for impairment 17   20      
Unallocated 0   0      
Total allowance for loan and lease losses 76 79 81 86 89 89
Individually evaluated for impairment 752   736      
Collectively evaluated for impairment 15,790   14,589      
Purchased credit impaired 43          
Total portfolio loans and leases 16,585   15,325      
Consumer Portfolio Segment            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 35   38      
Collectively evaluated for impairment 241   229      
Unallocated 0   0      
Total allowance for loan and lease losses 276 270 267 229 222 234
Individually evaluated for impairment 262   278      
Collectively evaluated for impairment 21,462   19,912      
Purchased credit impaired 20          
Total portfolio loans and leases 21,744   20,190      
Unallocated            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 0   0      
Unallocated 112   110      
Total allowance for loan and lease losses 112 $ 112 110 $ 108 $ 114 $ 120
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 0   0      
Purchased credit impaired 0          
Total portfolio loans and leases $ 0   $ 0