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Loans - Delinquency Ratio for Consumer Loan (Detail) (Consumer Loans [Member], USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]    
Delinquent Loans $ 1,227 $ 1,316
Delinquency Ratio 6.42% 6.80%
Total residential mortgages [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Delinquent Loans 1,191 1,276
Delinquency Ratio 6.66% 7.11%
Residential Mortgage [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Delinquent Loans 1,132 [1] 1,208 [1]
Delinquency Ratio 7.10% [1] 7.59% [1]
Home Equity Mortgages [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Delinquent Loans 59 68
Delinquency Ratio 3.04% 3.38%
Credit Cards [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Delinquent Loans 19 21
Delinquency Ratio 2.78% 2.46%
Other consumer
   
Financing Receivable, Recorded Investment [Line Items]    
Delinquent Loans $ 17 $ 19
Delinquency Ratio 3.11% 3.32%
[1] At March 31, 2014 and December 31, 2013, residential mortgage loan delinquency includes $1,041 million and $1,074 million, respectively, of loans that are carried at the lower of amortized cost or fair value of the collateral less cost to sell.