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Schedule I (Summary Of Investments Other Than Investments In Related Parties) (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012
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Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | $ 5,758
Fair Value | 5,862
Amount at which shown in the balance sheet | 5,862
Consolidated VIEs [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 5,309
Fair Value | 5,034
Amount at which shown in the balance sheet | 5,189
Other Aggregated Investments [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 9
Fair Value | 9
Amount at which shown in the balance sheet | 9
Long Term Available-For-Sale [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 4,582
Fair Value | 4,685
Amount at which shown in the balance sheet | 4,685
Long Term Available-For-Sale [Member] | U.S. Treasury And Government Agency [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 752
Fair Value | 791
Amount at which shown in the balance sheet | 791
Long Term Available-For-Sale [Member] | State And Municipal Bonds [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 1,417
Fair Value | 1,502
Amount at which shown in the balance sheet | 1,502
Long Term Available-For-Sale [Member] | State And Municipal Bonds [Member] | Consolidated VIEs [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 33
Fair Value | 36
Amount at which shown in the balance sheet | 36
Long Term Available-For-Sale [Member] | Foreign Governments [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 151
Fair Value | 164
Amount at which shown in the balance sheet | 164
Long Term Available-For-Sale [Member] | Corporate Obligations [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 916
Fair Value | 945
Amount at which shown in the balance sheet | 945
Long Term Available-For-Sale [Member] | Corporate Obligations [Member] | Consolidated VIEs [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 175
Fair Value | 178
Amount at which shown in the balance sheet | 178
Short Term Available-For-Sale [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 881
Fair Value | 888
Amount at which shown in the balance sheet | 888
Equity Available For Sale [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 22
Fair Value | 23
Amount at which shown in the balance sheet | 23
AFS Investments [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 5,485
Fair Value | 5,596
Amount at which shown in the balance sheet | 5,596
AFS Investments [Member] | Consolidated VIEs [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 637
Fair Value | 625
Amount at which shown in the balance sheet | 625
Fair Value [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 264
Fair Value | 257
Amount at which shown in the balance sheet | 257
Fair Value [Member] | Consolidated VIEs [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 1,843
Fair Value | 1,735
Amount at which shown in the balance sheet | 1,735
HTM Investments [Member] | Consolidated VIEs [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 2,829
Fair Value | 2,674
Amount at which shown in the balance sheet | 2,829
HTM Investments [Member] | Corporate Obligations [Member] | Consolidated VIEs [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 2,829
Fair Value | 2,674
Amount at which shown in the balance sheet | 2,829
Mortgage-Backed Securities [Member] | Long Term Available-For-Sale [Member] | Residential Mortgage-Backed Securities [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 928
Fair Value | 946
Amount at which shown in the balance sheet | 946
Mortgage-Backed Securities [Member] | Long Term Available-For-Sale [Member] | Residential Mortgage-Backed Non-Agency [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 79
Fair Value | 80
Amount at which shown in the balance sheet | 80
Mortgage-Backed Securities [Member] | Long Term 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 | 92
Fair Value | 82
Amount at which shown in the balance sheet | 82
Mortgage-Backed Securities [Member] | Long Term Available-For-Sale [Member] | Commercial Mortgage-Backed [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 46
Fair Value | 42
Amount at which shown in the balance sheet | 42
Mortgage-Backed Securities [Member] | Long Term 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 | 97
Fair Value | 89
Amount at which shown in the balance sheet | 89
Mortgage-Backed Securities [Member] | Long Term 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 | 20
Fair Value | 20
Amount at which shown in the balance sheet | 20
Asset-Backed Securities [Member] | Long Term Available-For-Sale [Member] | Consolidated VIEs [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 417
Fair Value | 405
Amount at which shown in the balance sheet | 405
Asset-Backed Securities [Member] | Long Term Available-For-Sale [Member] | Collateralized Debt Obligations [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 157
Fair Value | 87
Amount at which shown in the balance sheet | 87
Asset-Backed Securities [Member] | Long Term Available-For-Sale [Member] | Other Asset-Backed [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 136
Fair Value | 128
Amount at which shown in the balance sheet | 128
Asset-Backed Securities [Member] | Short Term Available-For-Sale [Member] | Consolidated VIEs [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 220
Fair Value | 220
Amount at which shown in the balance sheet | $ 220

X
- 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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X
- 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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