Loans - Additional Information (Detail) (USD $)	12 Months Ended				48 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential mortgage loan delinquency carried at lower of amortized cost or fair value less cost to sell	$ 1,100,000,000		$ 1,000,000,000		$ 1,100,000,000
Loans	67,695,000,000		63,258,000,000	51,867,000,000	67,695,000,000
Net deferred origination costs (Fees)	(23,000,000)		27,000,000		(23,000,000)
Net unamortized premium on loans	16,000,000		22,000,000		16,000,000
Amortized net premiums on loans	4,000,000		23,000,000	35,000,000
Total nonaccruing loans	1,305,000,000		1,629,000,000		1,305,000,000
Interest income that would have been recorded if the nonaccrual receivable had been current in accordance with contractual terms during the period	107,000,000		125,000,000
Current interest income (expense) in finance loans	35,000,000		19,000,000
Commercial loans removed from TDR classification					11,000,000
Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	19,201,000,000		19,108,000,000		19,201,000,000
Total nonaccruing loans	1,026,000,000		1,129,000,000		1,026,000,000
Weighted average rate of reduction	1.90%		1.90%
Parent And Other Subsidiaries Of Common Parent [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,328,000,000		4,514,000,000		5,328,000,000
Residential Mortgage And Home Equity [Member] | Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential mortgage loan delinquency carried at lower of amortized cost or fair value less cost to sell	900,000,000		1,000,000,000		900,000,000
Loans	17,837,000,000		17,695,000,000		17,837,000,000
Total nonaccruing loans	$ 1,026,000,000	[1]	$ 1,124,000,000		$ 1,026,000,000	[1]

[1] 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.