Loans - Delinquency Ratio for Consumer Loan (Detail) (Consumer Loans [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Delinquent Loans	$ 1,326		$ 1,359
Delinquency Ratio	6.85%		6.92%
Total residential mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Delinquent Loans	1,276		1,308
Delinquency Ratio	7.11%		7.20%
Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Delinquent Loans	1,208	[1]	1,233	[1]
Delinquency Ratio	7.59%	[1]	7.78%	[1]
Home Equity Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Delinquent Loans	68		75
Delinquency Ratio	3.38%		3.23%
Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Delinquent Loans	21		21
Delinquency Ratio	2.46%		2.58%
Other consumer
Financing Receivable, Recorded Investment [Line Items]
Delinquent Loans	$ 29		$ 30
Delinquency Ratio	5.06%		4.52%

[1] At December 31, 2013 and 2012, residential mortgage loan delinquency includes $1.1 billion and $1.0 billion, respectively, of loans that are carried at the lower of amortized cost or fair value of the collateral less cost to sell.