Composition of the Company's Loan Portfolio (Parenthetical) (Detail) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans carried at fair value	$ 452	$ 492
Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans carried at fair value	3	4
Commercial Portfolio Segment \| Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans carried at fair value	3	4
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans carried at fair value	449	488
Residential Mortgage Loans \| Residential Nonguaranteed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans carried at fair value	$ 449	$ 488

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents loan receivable as presented on the statement of financial position which may include mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts, or any other loans which are due the Company as of the balance sheet date.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 114

-Paragraph 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Loan

-Topic 310

-SubTopic 10

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

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant