Payment Status for the LHFI Portfolio (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Loans Receivable, Fair Value Disclosure	$ 302	$ 379
Nonaccruing 90 Plus Days Past Due	653	975
Residential Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans Receivable, Fair Value Disclosure	302	379
Residential Nonguaranteed [Member]
Financing Receivable, Impaired [Line Items]
Loans Receivable, Fair Value Disclosure	$ 302	$ 379