Payment Status for the LHFI Portfolio (Additional Information) (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Loans Receivable, Fair Value Disclosure	$ 262	$ 272
Nonaccruing 90 Plus Days Past Due	278	388
Residential Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans Receivable, Fair Value Disclosure	$ 262	$ 272

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Glossary Loan

-URI http://asc.fasb.org/extlink&oid=6517073

Name:	us-gaap_LoansReceivableFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant