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Loans - Delinquency Ratio for Consumer Loan (Detail) - Consumer Loans [Member] - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Delinquent Loans $ 983 $ 1,103
Delinquency Ratio 4.88% 5.59%
Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Delinquent Loans [1],[2] $ 903 $ 1,013
Delinquency Ratio [1],[2] 5.23% 6.07%
Home Equity Mortgages [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Delinquent Loans [1],[2] $ 56 $ 62
Delinquency Ratio [1],[2] 3.32% 3.48%
Credit Cards [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Delinquent Loans $ 13 $ 14
Delinquency Ratio 1.88% 1.94%
Other consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Delinquent Loans $ 11 $ 14
Delinquency Ratio 2.21% 2.52%
[1] At June 30, 2015 and December 31, 2014, consumer mortgage loan delinquency includes $873 million and $936 million, respectively, of loans that are carried at the lower of amortized cost or fair value of the collateral less cost to sell.
[2] At June 30, 2015 and December 31, 2014, consumer mortgage loans include $634 million and $658 million, respectively, of loans that were in the process of foreclosure.