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Allowance for Credit Losses - Allowance and Carrying Value by Portfolio Segment (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Impaired loans and troubled debt restructurings            
Allowance for loan and lease losses $ 568   $ 608      
Carrying value $ 9,761   $ 11,555      
Allowance as a percentage of carrying value 5.82%   5.26%      
Loans collectively evaluated for impairment            
Allowance for loan and lease losses $ 8,865   $ 8,993      
Carrying value $ 955,475   $ 930,991      
Allowance as a percentage of carrying value 0.93%   0.97%      
Total            
Allowance for loan and lease losses $ 9,433 $ 9,527 $ 9,601 $ 9,734 $ 10,050 $ 10,393
Carrying value $ 965,236   $ 942,546      
Allowance as a percentage of carrying value 0.98%   1.02%      
Loans and leases $ 972,910   $ 946,895      
Estimate of Fair Value Measurement            
Total            
Loans and leases 7,674   4,349      
Consumer real estate            
Impaired loans and troubled debt restructurings            
Allowance for loan and lease losses 145   258      
Carrying value $ 6,317   $ 8,556      
Allowance as a percentage of carrying value 2.30%   3.02%      
Loans collectively evaluated for impairment            
Allowance for loan and lease losses $ 446   $ 670      
Carrying value $ 262,729   $ 248,287      
Allowance as a percentage of carrying value 0.17%   0.27%      
Total            
Allowance for loan and lease losses $ 591 719 $ 928 1,158 1,366 1,720
Carrying value $ 269,046   $ 256,843      
Allowance as a percentage of carrying value 0.22%   0.36%      
Consumer real estate | Estimate of Fair Value Measurement            
Total            
Loans and leases $ 640   $ 682      
Credit card and other consumer            
Impaired loans and troubled debt restructurings            
Allowance for loan and lease losses 179   154      
Carrying value $ 657   $ 566      
Allowance as a percentage of carrying value 27.25%   27.21%      
Loans collectively evaluated for impairment            
Allowance for loan and lease losses $ 3,806   $ 3,720      
Carrying value $ 185,333   $ 189,140      
Allowance as a percentage of carrying value 2.05%   1.97%      
Total            
Allowance for loan and lease losses $ 3,985 3,970 $ 3,874 3,822 3,774 3,663
Carrying value $ 185,990   $ 189,706      
Allowance as a percentage of carrying value 2.14%   2.04%      
Commercial            
Impaired loans and troubled debt restructurings            
Allowance for loan and lease losses $ 244   $ 196      
Carrying value $ 2,787   $ 2,433      
Allowance as a percentage of carrying value 8.75%   8.06%      
Loans collectively evaluated for impairment            
Allowance for loan and lease losses $ 4,613   $ 4,603      
Carrying value $ 507,413   $ 493,564      
Allowance as a percentage of carrying value 0.91%   0.93%      
Total            
Allowance for loan and lease losses $ 4,857 $ 4,838 $ 4,799 $ 4,754 $ 4,910 $ 5,010
Carrying value $ 510,200   $ 495,997      
Allowance as a percentage of carrying value 0.95%   0.97%      
Loans and leases $ 517,234   $ 499,664      
Commercial | Estimate of Fair Value Measurement            
Total            
Loans and leases $ 7,034   $ 3,667