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.