LHFI by Credit Quality Indicator (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 127,877	[1]	$ 121,470	[1]
Residential Guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,416		4,252
Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	24,412	[2],[3]	23,389	[2],[4]
Federally Guaranteed Student Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	5,545		5,357
FICO Score 700 and Above [Member] | Residential Guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,400		4,300
FICO Score 700 and Above [Member] | Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 19,100	[2]	$ 17,410	[2]

[1] 2 Includes loans of consolidated VIEs of $327 million and $365 million at December 31, 2013 and 2012, respectively.

[2] Excludes $3.4 billion and $4.3 billion at December 31, 2013 and 2012, respectively, of guaranteed residential loans. At December 31, 2013 and 2012, the majority of these loans had FICO scores of 700 and above.

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

[4] Includes $379 million of loans carried at fair value, the majority of which were accruing current.