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
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Impaired loans and troubled debt restructurings        
Allowance for loan and lease losses $ 706 $ 663    
Carrying value $ 13,991 $ 15,451    
Allowance as a percentage of carrying value 5.05% 4.29%    
Loans collectively evaluated for impairment        
Allowance for loan and lease losses $ 9,312 $ 9,441    
Carrying value $ 903,963 $ 904,871    
Allowance as a percentage of carrying value 1.03% 1.04%    
Purchased credit-impaired loans        
Valuation allowance $ 11,042   $ 11,869  
Valuation allowance as a percentage of carrying value 2.39% 2.70%    
Total        
Allowance for loan and lease losses $ 10,260 $ 10,393 11,112 $ 11,237
Carrying value $ 928,089 $ 931,039    
Allowance as a percentage of carrying value 1.11% 1.12%    
Loans and leases $ 934,078 $ 936,749    
Estimate of Fair Value Measurement        
Total        
Loans and leases 5,989 5,710    
Purchased Credit-impaired        
Purchased credit-impaired loans        
Valuation allowance 242 289    
Carrying value gross of valuation allowance 10,135 10,717    
Total        
Loans and leases 10,135 10,717    
Consumer real estate        
Impaired loans and troubled debt restructurings        
Allowance for loan and lease losses 338 348    
Carrying value $ 10,872 $ 12,554    
Allowance as a percentage of carrying value 3.11% 2.77%    
Loans collectively evaluated for impairment        
Allowance for loan and lease losses $ 950 $ 1,083    
Carrying value $ 238,413 $ 238,284    
Allowance as a percentage of carrying value 0.40% 0.45%    
Purchased credit-impaired loans        
Valuation allowance $ 1,530   2,565  
Valuation allowance as a percentage of carrying value 2.39% 2.70%    
Total        
Allowance for loan and lease losses $ 1,530 $ 1,720 2,565 2,750
Carrying value $ 259,420 $ 261,555    
Allowance as a percentage of carrying value 0.59% 0.66%    
Consumer real estate | Estimate of Fair Value Measurement        
Total        
Loans and leases $ 894 $ 928    
Consumer real estate | Purchased Credit-impaired        
Purchased credit-impaired loans        
Valuation allowance 242 289    
Carrying value gross of valuation allowance 10,135 10,717    
Credit card and other consumer        
Impaired loans and troubled debt restructurings        
Allowance for loan and lease losses 128 125    
Carrying value $ 501 $ 490    
Allowance as a percentage of carrying value 25.55% 25.51%    
Loans collectively evaluated for impairment        
Allowance for loan and lease losses $ 3,592 $ 3,538    
Carrying value $ 186,586 $ 192,303    
Allowance as a percentage of carrying value 1.93% 1.84%    
Purchased credit-impaired loans        
Valuation allowance $ 3,720   3,329  
Total        
Allowance for loan and lease losses 3,720 $ 3,663 3,329 3,229
Carrying value $ 187,087 $ 192,793    
Allowance as a percentage of carrying value 1.99% 1.90%    
Commercial        
Impaired loans and troubled debt restructurings        
Allowance for loan and lease losses $ 240 $ 190    
Carrying value $ 2,618 $ 2,407    
Allowance as a percentage of carrying value 9.17% 7.89%    
Loans collectively evaluated for impairment        
Allowance for loan and lease losses $ 4,770 $ 4,820    
Carrying value $ 478,964 $ 474,284    
Allowance as a percentage of carrying value 1.00% 1.02%    
Purchased credit-impaired loans        
Valuation allowance $ 5,792   5,975  
Total        
Allowance for loan and lease losses 5,010 $ 5,010 $ 5,218 $ 5,258
Carrying value $ 481,582 $ 476,691    
Allowance as a percentage of carrying value 1.04% 1.05%    
Loans and leases $ 486,677 $ 481,473    
Commercial | Estimate of Fair Value Measurement        
Total        
Loans and leases 5,095 4,782    
Commercial | United States        
Total        
Loans and leases $ 288,476 $ 284,836