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Investments (Available-For-Sale Securities Continuous Unrealized Loss Position) (Detail) (USD $) In Millions, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | $ 304 | $ 912
Less than 12 Months, Unrealized Losses | (1) | (36)
12 Months or Longer, Fair Value | 721 | 1,475
12 Months or Longer, Unrealized Losses | (190) | (442)
Total, Fair Value | 1,025 | 2,387
Total, Unrealized Losses | (191) | (478)
Fixed-Maturity Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 304 | 820
Less than 12 Months, Unrealized Losses | (1) | (33)
12 Months or Longer, Fair Value | 478 | 1,252
12 Months or Longer, Unrealized Losses | (160) | (385)
Total, Fair Value | 782 | 2,072
Total, Unrealized Losses | (161) | (418)
Perpetual Preferred Securities [Member] | Other Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value |  | 47
Less than 12 Months, Unrealized Losses |  | (3)
12 Months or Longer, Fair Value | 3 | 45
12 Months or Longer, Unrealized Losses |  | (16)
Total, Fair Value | 3 | 92
Total, Unrealized Losses |  | (19)
Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 270 |
Total, Unrealized Losses | (52) |
Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 273 |
Total, Unrealized Losses | (99) |
Taxable Bonds [Member] | Fixed-Maturity Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 303 | 806
Less than 12 Months, Unrealized Losses | (1) | (33)
12 Months or Longer, Fair Value | 456 | 1,177
12 Months or Longer, Unrealized Losses | (160) | (383)
Total, Fair Value | 759 | 1,983
Total, Unrealized Losses | (161) | (416)
Taxable Bonds [Member] | U.S. Treasury And Government Agency [Member] | Fixed-Maturity Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 197 | 200
Less than 12 Months, Unrealized Losses | (1) |
12 Months or Longer, Fair Value |  |
12 Months or Longer, Unrealized Losses |  |
Total, Fair Value | 197 | 200
Total, Unrealized Losses | (1) |
Taxable Bonds [Member] | Foreign Governments [Member] | Fixed-Maturity Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 24 | 20
Less than 12 Months, Unrealized Losses |  |
12 Months or Longer, Fair Value |  |
12 Months or Longer, Unrealized Losses |  |
Total, Fair Value | 24 | 20
Total, Unrealized Losses |  |
Taxable Bonds [Member] | Corporate Obligations [Member] | Fixed-Maturity Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 60 | 297
Less than 12 Months, Unrealized Losses |  | (15)
12 Months or Longer, Fair Value | 49 | 418
12 Months or Longer, Unrealized Losses | (21) | (91)
Total, Fair Value | 109 | 715
Total, Unrealized Losses | (21) | (106)
Taxable Bonds [Member] | State And Municipal Bonds [Member] | Fixed-Maturity Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 6 | 152
Less than 12 Months, Unrealized Losses |  | (2)
12 Months or Longer, Fair Value | 66 | 76
12 Months or Longer, Unrealized Losses | (11) | (15)
Total, Fair Value | 72 | 228
Total, Unrealized Losses | (11) | (17)
Taxable Bonds [Member] | Mortgage-Backed Securities [Member] | Residential Mortgage-Backed Agency [Member] | Fixed-Maturity Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 8 | 20
Less than 12 Months, Unrealized Losses |  |
12 Months or Longer, Fair Value | 41 | 49
12 Months or Longer, Unrealized Losses |  |
Total, Fair Value | 49 | 69
Total, Unrealized Losses |  |
Taxable Bonds [Member] | Mortgage-Backed Securities [Member] | Residential Mortgage-Backed Non-Agency [Member] | Fixed-Maturity Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 2 | 34
Less than 12 Months, Unrealized Losses |  | (5)
12 Months or Longer, Fair Value | 102 | 167
12 Months or Longer, Unrealized Losses | (36) | (78)
Total, Fair Value | 104 | 201
Total, Unrealized Losses | (36) | (83)
Taxable Bonds [Member] | Mortgage-Backed Securities [Member] | Commercial Mortgage-Backed [Member] | Fixed-Maturity Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 3 | 17
Less than 12 Months, Unrealized Losses |  | (2)
12 Months or Longer, Fair Value | 27 | 22
12 Months or Longer, Unrealized Losses | (4) | (8)
Total, Fair Value | 30 | 39
Total, Unrealized Losses | (4) | (10)
Taxable Bonds [Member] | Asset-Backed Securities [Member] | Collateralized Debt Obligations [Member] | Fixed-Maturity Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 2 | 13
Less than 12 Months, Unrealized Losses |  | (2)
12 Months or Longer, Fair Value | 83 | 117
12 Months or Longer, Unrealized Losses | (74) | (116)
Total, Fair Value | 85 | 130
Total, Unrealized Losses | (74) | (118)
Taxable Bonds [Member] | Asset-Backed Securities [Member] | Other Asset-Backed [Member] | Fixed-Maturity Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 1 | 53
Less than 12 Months, Unrealized Losses |  | (7)
12 Months or Longer, Fair Value | 88 | 328
12 Months or Longer, Unrealized Losses | (14) | (75)
Total, Fair Value | 89 | 381
Total, Unrealized Losses | (14) | (82)
Tax-Exempt Bonds [Member] | State And Municipal Bonds [Member] | Fixed-Maturity Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 1 | 14
Less than 12 Months, Unrealized Losses |  |
12 Months or Longer, Fair Value | 22 | 75
12 Months or Longer, Unrealized Losses |  | (2)
Total, Fair Value | 23 | 89
Total, Unrealized Losses |  | (2)
Variable Interest Entity [Member] | Corporate Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value |  | 2
Less than 12 Months, Unrealized Losses |  |
12 Months or Longer, Fair Value | 54 |
12 Months or Longer, Unrealized Losses | (7) |
Total, Fair Value | 54 | 2
Total, Unrealized Losses | (7) |
Variable Interest Entity [Member] | Mortgage-Backed Securities [Member] | Residential Mortgage-Backed Non-Agency [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value |  | 3
Less than 12 Months, Unrealized Losses |  |
12 Months or Longer, Fair Value | 87 | 90
12 Months or Longer, Unrealized Losses | (12) | (26)
Total, Fair Value | 87 | 93
Total, Unrealized Losses | (12) | (26)
Variable Interest Entity [Member] | Asset-Backed Securities [Member] | Collateralized Debt Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value |  | 9
Less than 12 Months, Unrealized Losses |  |
12 Months or Longer, Fair Value | 96 | 88
12 Months or Longer, Unrealized Losses | (11) | (15)
Total, Fair Value | 96 | 97
Total, Unrealized Losses | (11) | (15)
Variable Interest Entity [Member] | Asset-Backed Securities [Member] | Other Asset-Backed [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value |  | 31
Less than 12 Months, Unrealized Losses |  |
12 Months or Longer, Fair Value | 3 |
12 Months or Longer, Unrealized Losses |  |
Total, Fair Value | 3 | 31
Total, Unrealized Losses |  |

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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) -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 FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -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 This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -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 -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) -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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