Loans - Status of Consumer Loan Portfolio (Detail) (USD $)	Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual Loans	$ 1,175,000,000		$ 1,305,000,000
Accruing Loans Contractually Past Due 90 days or More	34,000,000		34,000,000
Total loans	68,897,000,000		67,695,000,000		62,932,000,000
Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing Loans	17,999,000,000		18,147,000,000
Nonaccrual Loans	978,000,000		1,026,000,000
Accruing Loans Contractually Past Due 90 days or More	27,000,000		28,000,000
Total loans	19,004,000,000		19,201,000,000
Consumer Loans [Member] | Total residential mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing Loans	16,860,000,000		16,811,000,000
Nonaccrual Loans	978,000,000	[1],[2],[3]	1,026,000,000	[1],[2],[3]
Accruing Loans Contractually Past Due 90 days or More	0		0
Total loans	17,838,000,000		17,837,000,000
Consumer Loans [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing Loans	14,993,000,000		14,877,000,000
Nonaccrual Loans	907,000,000		949,000,000
Accruing Loans Contractually Past Due 90 days or More	0		0
Total loans	15,900,000,000		15,826,000,000		15,730,000,000
Consumer Loans [Member] | Home Equity Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing Loans	1,867,000,000		1,934,000,000
Nonaccrual Loans	71,000,000		77,000,000
Accruing Loans Contractually Past Due 90 days or More	0		0
Total loans	1,938,000,000		2,011,000,000		2,236,000,000
Consumer Loans [Member] | Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing Loans	669,000,000		840,000,000
Nonaccrual Loans	0		0
Accruing Loans Contractually Past Due 90 days or More	14,000,000		14,000,000
Total loans	683,000,000		854,000,000		749,000,000
Consumer Loans [Member] | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Performing Loans	470,000,000		496,000,000
Nonaccrual Loans	0		0
Accruing Loans Contractually Past Due 90 days or More	13,000,000		14,000,000
Total loans	$ 483,000,000		$ 510,000,000		$ 578,000,000

[1] At March 31, 2014 and December 31, 2013, residential mortgage loan nonaccrual balances include $853 million and $866 million, respectively, of loans that are carried at the lower of amortized cost or fair value of the collateral less cost to sell.

[2] Residential mortgage nonaccrual loans for all periods does not include guaranteed loans purchased from the Government National Mortgage Association ("GNMA"). Repayment of these loans are predominantly insured by the Federal Housing Administration and as such, these loans have different risk characteristics from the rest of our customer loan portfolio.

[3] Nonaccrual residential mortgages includes all receivables which are 90 or more days contractually delinquent as well as loans discharged under Chapter 7 bankruptcy and not re-affirmed and second lien loans where the first lien loan that we own or service is 90 or more days contractually delinquent.