Composition of the Company's Loan Portfolio (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 129,744	[1]	$ 127,877	[1]
Loans Receivable, Fair Value Disclosure	292		302
Loans Held-for-sale, Fair Value Disclosure	1,353		1,378
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	39,861		43,190
Loans Receivable, Fair Value Disclosure	292		302
Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 24,173	[2],[3]	$ 24,412	[2],[4]

[1] Includes loans of consolidated VIEs of $307 million and $327 million at June 30, 2014 and December 31, 2013, respectively.

[2] Excludes $661 million and $3.4 billion at June 30, 2014 and December 31, 2013, respectively, of guaranteed residential loans. At June 30, 2014 and December 31, 2013, the majority of these loans had FICO scores of 700 and above.

[3] Includes $292 million of loans carried at fair value, the majority of which were accruing current.

[4] Includes $302 million of loans carried at fair value, the majority of which were accruing current.