Quarterly report pursuant to Section 13 or 15(d)

Allowance for Credit Losses - Allowance and Carrying Value by Portfolio Segment (Details)

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Allowance for Credit Losses - Allowance and Carrying Value by Portfolio Segment (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Impaired loans and troubled debt restructurings            
Allowance for loan and lease losses $ 682   $ 663      
Carrying value $ 13,476   $ 15,451      
Allowance as a percentage of carrying value 5.06%   4.29%      
Loans collectively evaluated for impairment            
Allowance for loan and lease losses $ 9,177   $ 9,441      
Carrying value $ 906,536   $ 904,871      
Allowance as a percentage of carrying value 1.01%   1.04%      
Purchased credit-impaired loans            
Valuation allowance $ 10,837     $ 11,632    
Valuation allowance as a percentage of carrying value 1.99%   2.70%      
Total            
Allowance for loan and lease losses $ 10,050 $ 10,260 $ 10,393 10,875 $ 11,112 $ 11,237
Carrying value $ 929,597   $ 931,039      
Allowance as a percentage of carrying value 1.08%   1.12%      
Loans and leases $ 935,824   $ 936,749      
Estimate of Fair Value Measurement            
Total            
Loans and leases 6,227   5,710      
Purchased Credit-impaired            
Purchased credit-impaired loans            
Valuation allowance 191   289      
Carrying value gross of valuation allowance 9,585   10,717      
Total            
Loans and leases 9,585   10,717      
Consumer real estate            
Impaired loans and troubled debt restructurings            
Allowance for loan and lease losses 327   348      
Carrying value $ 10,470   $ 12,554      
Allowance as a percentage of carrying value 3.12%   2.77%      
Loans collectively evaluated for impairment            
Allowance for loan and lease losses $ 848   $ 1,083      
Carrying value $ 241,096   $ 238,284      
Allowance as a percentage of carrying value 0.35%   0.45%      
Purchased credit-impaired loans            
Valuation allowance $ 1,366     2,309    
Valuation allowance as a percentage of carrying value 1.99%   2.70%      
Total            
Allowance for loan and lease losses $ 1,366 1,530 $ 1,720 2,309 2,565 2,750
Carrying value $ 261,151   $ 261,555      
Allowance as a percentage of carrying value 0.52%   0.66%      
Consumer real estate | Estimate of Fair Value Measurement            
Total            
Loans and leases $ 848   $ 928      
Consumer real estate | Purchased Credit-impaired            
Purchased credit-impaired loans            
Valuation allowance 191   289      
Carrying value gross of valuation allowance 9,585   10,717      
Credit card and other consumer            
Impaired loans and troubled debt restructurings            
Allowance for loan and lease losses 143   125      
Carrying value $ 517   $ 490      
Allowance as a percentage of carrying value 27.66%   25.51%      
Loans collectively evaluated for impairment            
Allowance for loan and lease losses $ 3,631   $ 3,538      
Carrying value $ 187,061   $ 192,303      
Allowance as a percentage of carrying value 1.94%   1.84%      
Purchased credit-impaired loans            
Valuation allowance $ 3,774     3,386    
Total            
Allowance for loan and lease losses 3,774 3,720 $ 3,663 3,386 3,329 3,229
Carrying value $ 187,578   $ 192,793      
Allowance as a percentage of carrying value 2.01%   1.90%      
Commercial            
Impaired loans and troubled debt restructurings            
Allowance for loan and lease losses $ 212   $ 190      
Carrying value $ 2,489   $ 2,407      
Allowance as a percentage of carrying value 8.52%   7.89%      
Loans collectively evaluated for impairment            
Allowance for loan and lease losses $ 4,698   $ 4,820      
Carrying value $ 478,379   $ 474,284      
Allowance as a percentage of carrying value 0.98%   1.02%      
Purchased credit-impaired loans            
Valuation allowance $ 5,697     5,937    
Total            
Allowance for loan and lease losses 4,910 $ 5,010 $ 5,010 $ 5,180 $ 5,218 $ 5,258
Carrying value $ 480,868   $ 476,691      
Allowance as a percentage of carrying value 1.02%   1.05%      
Loans and leases $ 486,247   $ 481,473      
Commercial | Estimate of Fair Value Measurement            
Total            
Loans and leases $ 5,379   $ 4,782