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Investments (Available For Sale Securities Continuous Unrealized Loss Position) (Details) (USD $) In Millions | Sep. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | $ 829 | $ 4,530
Less than 12 Months, Unrealized Losses | (37) | (142)
12 Months or Longer, Fair Value | 1,720 | 2,424
12 Months or Longer, Unrealized Losses | (530) | (662)
Total, Fair Value | 2,549 | 6,954
Total, Unrealized Losses | (567) | (804)
Variable Interest Entity, Primary Beneficiary [Member] | Collateralized Debt Obligations [Member] | Asset-Backed Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 69 | 62
Less than 12 Months, Unrealized Losses | (1) | (1)
12 Months or Longer, Fair Value | 102 | 5
12 Months or Longer, Unrealized Losses | (13) |
Total, Fair Value | 171 | 67
Total, Unrealized Losses | (14) | (1)
Variable Interest Entity, Primary Beneficiary [Member] | Mortgage-Backed Securities [Member] | Residential Mortgage-Backed Non-Agency [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 4 |
12 Months or Longer, Fair Value | 93 |
12 Months or Longer, Unrealized Losses | (28) |
Total, Fair Value | 97 |
Total, Unrealized Losses | (28) |
Variable Interest Entity, Primary Beneficiary [Member] | Asset-Backed Securities [Member] | Other Asset-Backed [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 8 | 7
Total, Fair Value | 8 | 7
Residential Mortgage-Backed Securities [Member] | Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | Mortgage-Backed Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 22 | 785
Less than 12 Months, Unrealized Losses |  | (11)
12 Months or Longer, Fair Value | 51 | 59
12 Months or Longer, Unrealized Losses |  | (2)
Total, Fair Value | 73 | 844
Total, Unrealized Losses |  | (13)
Commercial Mortgage-Backed [Member] | Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | Mortgage-Backed Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 18 | 11
Less than 12 Months, Unrealized Losses | (2) |
12 Months or Longer, Fair Value | 24 | 85
12 Months or Longer, Unrealized Losses | (6) | (19)
Total, Fair Value | 42 | 96
Total, Unrealized Losses | (8) | (19)
Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | Mortgage-Backed Securities [Member] | Residential Mortgage-Backed Non-Agency [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value |  | 51
Less than 12 Months, Unrealized Losses |  | (2)
12 Months or Longer, Fair Value |  | 336
12 Months or Longer, Unrealized Losses |  | (178)
Total, Fair Value |  | 387
Total, Unrealized Losses |  | (180)
Mortgage-Backed Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total, Fair Value | 450 |
Total, Unrealized Losses | 121 |
Collateralized Debt Obligations [Member] | Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | Asset-Backed Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 14 | 3
Less than 12 Months, Unrealized Losses | (2) |
12 Months or Longer, Fair Value | 130 | 278
12 Months or Longer, Unrealized Losses | (121) | (180)
Total, Fair Value | 144 | 281
Total, Unrealized Losses | (123) | (180)
Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | Asset-Backed Securities [Member] | Other Asset-Backed [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 82 | 61
Less than 12 Months, Unrealized Losses | (12) | (2)
12 Months or Longer, Fair Value | 318 | 480
12 Months or Longer, Unrealized Losses | (136) | (110)
Total, Fair Value | 400 | 541
Total, Unrealized Losses | (148) | (112)
Asset-Backed Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total, Fair Value | 723 |
Total, Unrealized Losses | (285) |
Fixed-Maturity Investments [Member] | Taxable Bonds [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 517 | 2,436
Less than 12 Months, Unrealized Losses | (29) | (58)
12 Months or Longer, Fair Value | 1,280 | 2,098
12 Months or Longer, Unrealized Losses | (455) | (629)
Total, Fair Value | 1,797 | 4,534
Total, Unrealized Losses | (484) | (687)
Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | U.S. Treasury And Government Agency [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 16 | 370
Less than 12 Months, Unrealized Losses |  | (3)
Total, Fair Value | 16 | 370
Total, Unrealized Losses |  | (3)
Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | Foreign Governments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 31 | 33
Less than 12 Months, Unrealized Losses |  | (1)
Total, Fair Value | 31 | 33
Total, Unrealized Losses |  | (1)
Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | Corporate Obligations [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 277 | 685
Less than 12 Months, Unrealized Losses | (8) | (13)
12 Months or Longer, Fair Value | 497 | 725
12 Months or Longer, Unrealized Losses | (101) | (114)
Total, Fair Value | 774 | 1,410
Total, Unrealized Losses | (109) | (127)
Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | State And Municipal Bonds [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value |  | 437
Less than 12 Months, Unrealized Losses |  | (26)
12 Months or Longer, Fair Value | 79 | 135
12 Months or Longer, Unrealized Losses | (11) | (26)
Total, Fair Value | 79 | 572
Total, Unrealized Losses | (11) | (52)
Fixed-Maturity Investments [Member] | State And Municipal Bonds [Member] | Tax-Exempt Bonds [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 182 | 2,002
Less than 12 Months, Unrealized Losses | (3) | (83)
12 Months or Longer, Fair Value | 162 | 181
12 Months or Longer, Unrealized Losses | (7) | (21)
Total, Fair Value | 344 | 2,183
Total, Unrealized Losses | (10) | (104)
Fixed-Maturity Investments [Member] | Tax-Exempt Bonds [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 182 | 2,002
Less than 12 Months, Unrealized Losses | (3) | (83)
12 Months or Longer, Fair Value | 162 | 181
12 Months or Longer, Unrealized Losses | (7) | (21)
Total, Fair Value | 344 | 2,183
Total, Unrealized Losses | (10) | (104)
Other Long Term Investments [Member] | Perpetual Preferred Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 49 | 20
Less than 12 Months, Unrealized Losses | (4) |
12 Months or Longer, Fair Value | 83 | 140
12 Months or Longer, Unrealized Losses | (27) | (12)
Total, Fair Value | 132 | 160
Total, Unrealized Losses | (31) | (12)
Other Long Term Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 49 | 23
Less than 12 Months, Unrealized Losses | (4) |
12 Months or Longer, Fair Value | 83 | 140
12 Months or Longer, Unrealized Losses | (27) | (12)
Total, Fair Value | 132 | 163
Total, Unrealized Losses | (31) | (12)
Other Long Term Investments [Member] | Other Long Term Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value |  | 3
Total, Fair Value |  | 3
Fixed-Maturity Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 699 | 4,438
Less than 12 Months, Unrealized Losses | (32) | (141)
12 Months or Longer, Fair Value | 1,442 | 2,279
12 Months or Longer, Unrealized Losses | (462) | (650)
Total, Fair Value | 2,141 | 6,717
Total, Unrealized Losses | $ (494) | $ (791)

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- Definition This item represents the excess of amortized cost basis over fair value of securities in a loss position and 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)(2) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a -Clause 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a -Clause 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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