Loans - Status of Consumer Loan Portfolio (Detail) (USD $)	Jun. 30, 2014		Dec. 31, 2013		Jun. 30, 2013
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual Loans	$ 1,107,000,000		$ 1,305,000,000
Accruing Loans Contractually Past Due 90 days or More	30,000,000		34,000,000
Total loans	72,198,000,000		67,695,000,000		66,705,000,000
Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing Loans	18,195,000,000		18,147,000,000
Nonaccrual Loans	948,000,000		1,026,000,000
Accruing Loans Contractually Past Due 90 days or More	22,000,000		28,000,000
Total loans	19,165,000,000		19,201,000,000
Consumer Loans [Member] | Total residential mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing Loans	17,063,000,000		16,811,000,000
Nonaccrual Loans	948,000,000	[1],[2],[3]	1,026,000,000	[1],[2],[3]
Accruing Loans Contractually Past Due 90 days or More	0		0
Total loans	18,011,000,000		17,837,000,000
Consumer Loans [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing Loans	15,218,000,000		14,877,000,000
Nonaccrual Loans	879,000,000		949,000,000
Accruing Loans Contractually Past Due 90 days or More	0		0
Total loans	16,097,000,000		15,826,000,000		15,837,000,000
Consumer Loans [Member] | Home Equity Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing Loans	1,845,000,000		1,934,000,000
Nonaccrual Loans	69,000,000		77,000,000
Accruing Loans Contractually Past Due 90 days or More	0		0
Total loans	1,914,000,000		2,011,000,000		2,172,000,000
Consumer Loans [Member] | Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing Loans	670,000,000		840,000,000
Nonaccrual Loans	0		0
Accruing Loans Contractually Past Due 90 days or More	11,000,000		14,000,000
Total loans	681,000,000		854,000,000		858,000,000
Consumer Loans [Member] | Other consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing Loans	462,000,000		496,000,000
Nonaccrual Loans	0		0
Accruing Loans Contractually Past Due 90 days or More	11,000,000		14,000,000
Total loans	$ 473,000,000		$ 510,000,000		$ 574,000,000

[1] 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.

[2] 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.

[3] At June 30, 2014 and December 31, 2013, residential mortgage loan nonaccrual balances include $849 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.