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Schedule I (Summary of Investments, Other than Investments in Related Parties) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011
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Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | $ 8,900
Fair Value | 8,693
Amount at which shown in the balance sheet | 8,693
Fixed-Maturity Investments [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 8,755
Fair Value | 8,566
Amount at which shown in the balance sheet | 8,566
Other Aggregated Investments [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 145
Fair Value | 127
Amount at which shown in the balance sheet | 127
Consolidated VIEs [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 7,403
Fair Value | 6,805
Amount at which shown in the balance sheet | 7,159
Other Aggregated Investments [Member] | Fixed-Maturity Investments [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 199
Fair Value | 199
Amount at which shown in the balance sheet | 199
Subtotal Long-Term Available-For-Sale [Member] | Fixed-Maturity Investments [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 6,721
Fair Value | 6,570
Amount at which shown in the balance sheet | 6,570
Short Term Available-For-Sale [Member] | Fixed-Maturity Investments [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 1,697
Fair Value | 1,691
Amount at which shown in the balance sheet | 1,691
Total Available-For-Sale [Member] | Fixed-Maturity Investments [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 8,418
Fair Value | 8,261
Amount at which shown in the balance sheet | 8,261
Total Available-For-Sale [Member] | Consolidated VIEs [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 473
Fair Value | 432
Amount at which shown in the balance sheet | 432
Total Available-For-Sale [Member] | U.S. Treasury And Government Agency [Member] | Fixed-Maturity Investments [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 783
Fair Value | 822
Amount at which shown in the balance sheet | 822
Total Available-For-Sale [Member] | Foreign Governments [Member] | Fixed-Maturity Investments [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 264
Fair Value | 286
Amount at which shown in the balance sheet | 286
Total Available-For-Sale [Member] | Corporate Obligations [Member] | Fixed-Maturity Investments [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 1,437
Fair Value | 1,375
Amount at which shown in the balance sheet | 1,375
Total Available-For-Sale [Member] | Corporate Obligations [Member] | Consolidated VIEs [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 2
Fair Value | 2
Amount at which shown in the balance sheet | 2
Total Available-For-Sale [Member] | Taxable Bonds [Member] | State And Municipal Bonds [Member] | Fixed-Maturity Investments [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 893
Fair Value | 910
Amount at which shown in the balance sheet | 910
Total Available-For-Sale [Member] | Tax-Exempt Bonds [Member] | State And Municipal Bonds [Member] | Fixed-Maturity Investments [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 1,064
Fair Value | 1,103
Amount at which shown in the balance sheet | 1,103
Fair Value [Member] | Fixed-Maturity Investments [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 337
Fair Value | 305
Amount at which shown in the balance sheet | 305
Fair Value [Member] | Consolidated VIEs [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 3,087
Fair Value | 2,884
Amount at which shown in the balance sheet | 2,884
Held-To-Maturity [Member] | Consolidated VIEs [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 3,843
Fair Value | 3,489
Amount at which shown in the balance sheet | 3,843
Asset-Backed Securities [Member] | Total Available-For-Sale [Member] | Collateralized Debt Obligations [Member] | Fixed-Maturity Investments [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 250
Fair Value | 133
Amount at which shown in the balance sheet | 133
Asset-Backed Securities [Member] | Total Available-For-Sale [Member] | Collateralized Debt Obligations [Member] | Consolidated VIEs [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 112
Fair Value | 97
Amount at which shown in the balance sheet | 97
Asset-Backed Securities [Member] | Total Available-For-Sale [Member] | Other Asset-Backed [Member] | Fixed-Maturity Investments [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 477
Fair Value | 401
Amount at which shown in the balance sheet | 401
Asset-Backed Securities [Member] | Total Available-For-Sale [Member] | Other Asset-Backed [Member] | Consolidated VIEs [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 41
Fair Value | 41
Amount at which shown in the balance sheet | 41
Asset-Backed Securities [Member] | Held-To-Maturity [Member] | Other Asset-Backed [Member] | Consolidated VIEs [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 3,843
Fair Value | 3,489
Amount at which shown in the balance sheet | 3,843
Mortgage-Backed Securities [Member] | Total Available-For-Sale [Member] | Residential Mortgage-Backed Securities [Member] | Fixed-Maturity Investments [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 1,190
Fair Value | 1,237
Amount at which shown in the balance sheet | 1,237
Mortgage-Backed Securities [Member] | Total Available-For-Sale [Member] | Residential Mortgage-Backed Non-Agency [Member] | Fixed-Maturity Investments [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 306
Fair Value | 255
Amount at which shown in the balance sheet | 255
Mortgage-Backed Securities [Member] | Total Available-For-Sale [Member] | Residential Mortgage-Backed Non-Agency [Member] | Consolidated VIEs [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 119
Fair Value | 93
Amount at which shown in the balance sheet | 93
Mortgage-Backed Securities [Member] | Total Available-For-Sale [Member] | Commercial Mortgage Backed [Member] | Fixed-Maturity Investments [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 57
Fair Value | 48
Amount at which shown in the balance sheet | $ 48

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- Definition This element represents the carrying (reported) amount of the entity's investments as of the balance sheet date. This amount may represent the individual investment's or group of similar investments' original cost, fair value, or such other amount at which the investment is shown in the entity's balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 15 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611379-123010 + Details
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- Definition This item represents the original cost of the entity's investments including investments in equity securities and, as to fixed maturities, original cost reduced by repayments and adjusted for amortization of premiums or accrual of discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 15 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611379-123010 + Details
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- Definition This item represents the reported amount of the entity's investments measured at fair value. Fair value is the price that would be received to sell an investment in an orderly transaction between market participants at the balance sheet [measurement] date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 15 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611379-123010 + Details
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