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Debt (Long-Term Debt) (Detail) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 16, 2008 | Dec. 31, 2012 | Dec. 31, 2011
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross |  | $ 723 |  | $ 901 |
Less unamortized discount |  | 1 |  | 1 |
Subtotal |  | 722 |  | 900 |
Non Variable Interest Entities [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total |  | 1,662 |  | 1,840 |
6.400% Senior Notes Due 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, interest rate |  | 6.40% |  |  |
Long-term debt, maturity, year |  | 2022 |  |  |
Initial Callable date |  | Aug. 15, 2006 |  |  |
6.400% Senior Notes Due 2022 [Member] | Non Variable Interest Entities [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross |  | 269 | [1] | 275 | [1]
7.000% Debentures Due 2025 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, interest rate |  | 7.00% |  |  |
Long-term debt, maturity, year |  | 2025 |  |  |
7.000% Debentures Due 2025 [Member] | Non Variable Interest Entities [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross |  | 56 |  | 56 |
7.150% Debentures Due 2027 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, interest rate |  | 7.15% |  |  |
Long-term debt, maturity, year |  | 2027 |  |  |
7.150% Debentures Due 2027 [Member] | Non Variable Interest Entities [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross |  | 100 |  | 100 |
6.625% Debentures Due 2028 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, interest rate |  | 6.625% |  |  |
Long-term debt, maturity, year |  | 2028 |  |  |
6.625% Debentures Due 2028 [Member] | Non Variable Interest Entities [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross |  | 141 |  | 141 |
5.700% Senior Notes Due 2034 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, interest rate |  | 5.70% |  |  |
Long-term debt, maturity, year |  | 2034 |  |  |
5.700% Senior Notes Due 2034 [Member] | Non Variable Interest Entities [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross |  | 157 | [2] | 329 | [2]
14% Surplus Notes Due 2033 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
14% Surplus Notes due 2033 | 1,000 | 940 | [3] | 940 | [3]
Long-term debt, interest rate | 14.00% | 14.00% |  |  |
Long-term debt, maturity, year |  | 2033 |  |  |
Initial Callable date |  | Jan. 15, 2018 |  |  |
Callable date for fifth anniversary of initial callable date |  | January 15, 2018 |  |  |
Callable date for subsequent fifth anniversary of initial callable date |  | January 15, 2023 |  |  |
Latest callable date before maturity |  | Jan. 15, 2028 |  |  |
Long-term debt, maturity date | Jan. 15, 2033 | Jan. 15, 2033 |  |  |
14% Surplus Notes Due 2033 [Member] | Non Variable Interest Entities [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
14% Surplus Notes due 2033 |  | $ 940 |  | $ 940 |
[1] | Callable on or after August 15, 2006 at 100.00.
[2] | Callable anytime at the greater of 100.00 or the present value of the remaining scheduled payments of principal and interest.
[3] | Callable on or after January 15, 2018 and every fifth anniversary thereafter at 100.00.

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- Definition Earliest date before maturity when the issuer can call the outstanding debt instrument for repayment or conversion to equity, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 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. + Details
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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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