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Loans and Allowance for Credit Losses - Additional Detail of Allowance for Credit Losses and Related Loan Balances by Portfolio Type (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Allowance Balance at End of Period            
Loans individually evaluated for impairment $ 58   $ 13      
TDRs collectively evaluated for impairment 300   345      
Other loans collectively evaluated for impairment 3,924   3,900      
Loans acquired with deteriorated credit quality 47   48      
Total allowance for credit losses 4,329 $ 4,320 4,306 $ 4,326 $ 4,351 $ 4,375
Loan Balance at End of Period            
Loans individually evaluated for impairment 668   390      
TDRs collectively evaluated for impairment 4,547   5,070      
Other loans collectively evaluated for impairment 260,641   252,590      
Loans acquired with deteriorated credit quality 2,665   2,799      
Total loans 264,287   256,253      
Total loans 268,521   260,849      
Commercial [Member]            
Allowance Balance at End of Period            
Loans individually evaluated for impairment 56   11      
TDRs collectively evaluated for impairment 5   10      
Other loans collectively evaluated for impairment 1,412   1,266      
Total allowance for credit losses 1,473 1,441 1,287 1,180 1,200 1,146
Loan Balance at End of Period            
Loans individually evaluated for impairment 639   336      
TDRs collectively evaluated for impairment 153   138      
Other loans collectively evaluated for impairment 91,715   87,927      
Loans acquired with deteriorated credit quality 7   1      
Total loans 92,514   88,402      
Commercial Real Estate [Member]            
Allowance Balance at End of Period            
Loans individually evaluated for impairment 2   2      
TDRs collectively evaluated for impairment 2   7      
Other loans collectively evaluated for impairment 733   703      
Loans acquired with deteriorated credit quality 11   12      
Total allowance for credit losses 748 734 724 735 721 726
Loan Balance at End of Period            
Loans individually evaluated for impairment 29   41      
TDRs collectively evaluated for impairment 189   235      
Other loans collectively evaluated for impairment 42,803   41,566      
Loans acquired with deteriorated credit quality 269   295      
Total loans 43,290   42,137      
Residential Mortgages [Member]            
Allowance Balance at End of Period            
TDRs collectively evaluated for impairment 206   236      
Other loans collectively evaluated for impairment 338   395      
Total allowance for credit losses 544 556 631 737 764 787
Loan Balance at End of Period            
Loans individually evaluated for impairment     13      
TDRs collectively evaluated for impairment 3,766   4,241      
Other loans collectively evaluated for impairment 52,137   49,241      
Loans acquired with deteriorated credit quality 1   1      
Total loans 55,904   53,496      
Other Retail [Member]            
Allowance Balance at End of Period            
TDRs collectively evaluated for impairment 28   33      
Other loans collectively evaluated for impairment 615   710      
Total allowance for credit losses 643 678 743 752 738 771
Loan Balance at End of Period            
TDRs collectively evaluated for impairment 193   211      
Other loans collectively evaluated for impairment 51,815   50,995      
Total loans 52,008   51,206      
Credit Card [Member]            
Allowance Balance at End of Period            
TDRs collectively evaluated for impairment 58   57      
Other loans collectively evaluated for impairment 826   826      
Total allowance for credit losses 884 875 883 873 871 880
Loan Balance at End of Period            
TDRs collectively evaluated for impairment 211   210      
Other loans collectively evaluated for impairment 20,360   20,802      
Total loans 20,571   21,012      
Total Loans, Excluding Covered Loans [Member]            
Allowance Balance at End of Period            
Loans individually evaluated for impairment 58   13      
TDRs collectively evaluated for impairment 299   343      
Other loans collectively evaluated for impairment 3,924   3,900      
Loans acquired with deteriorated credit quality 11   12      
Total allowance for credit losses 4,292 4,284 4,268 4,277 4,294 4,310
Loan Balance at End of Period            
Loans individually evaluated for impairment 668   390      
TDRs collectively evaluated for impairment 4,512   5,035      
Other loans collectively evaluated for impairment 258,830   250,531      
Loans acquired with deteriorated credit quality 277   297      
Total loans 264,287   256,253      
Covered Loans [Member]            
Allowance Balance at End of Period            
TDRs collectively evaluated for impairment 1   2      
Loans acquired with deteriorated credit quality 36   36      
Total allowance for credit losses 37 $ 36 38 $ 49 $ 57 $ 65
Loan Balance at End of Period            
TDRs collectively evaluated for impairment 35   35      
Other loans collectively evaluated for impairment 1,811   2,059      
Loans acquired with deteriorated credit quality 2,388   2,502      
Total loans $ 4,234   $ 4,596