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Loans - Delinquency Ratio for Consumer Loan (Detail) - Consumer Loans [Member] - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]    
Delinquent Loans $ 844 $ 938
Delinquency Ratio 4.09% 4.56%
Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Delinquent Loans [1],[2] $ 774 $ 858
Delinquency Ratio [1],[2] 4.28% 4.83%
Home Equity Mortgages [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Delinquent Loans [1],[2] $ 47 $ 56
Delinquency Ratio [1],[2] 3.22% 3.50%
Credit Cards [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Delinquent Loans $ 13 $ 13
Delinquency Ratio 1.95% 1.86%
Other consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Delinquent Loans $ 10 $ 11
Delinquency Ratio 2.20% 2.26%
[1] At September 30, 2016 and December 31, 2015, consumer mortgage loan delinquency includes $699 million and $793 million, respectively, of loans that are carried at the lower of amortized cost or fair value of the collateral less cost to sell, including $391 million and $3 million, respectively, relating to loans held for sale.
[2] At September 30, 2016 and December 31, 2015, consumer mortgage loans and loans held for sale include $495 million and $567 million, respectively, of loans that were in the process of foreclosure.