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Investments (Available For Sale Securities Continuous Unrealized Loss Position) (Details) (USD $) In Millions | Jun. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Less than 12 Months, Fair Value | $ 2,407 | $ 4,530
Less than 12 Months, Unrealized Losses | (53) | (142)
12 Months or Longer, Fair Value | 2,005 | 2,424
12 Months or Longer, Unrealized Losses | (479) | (662)
Total, Fair Value | 4,412 | 6,954
Total, Unrealized Losses | (532) | (804)
Variable Interest Entity, Primary Beneficiary [Member] | Collateralized Debt Obligations [Member] | Asset-Backed Securities [Member] |  |
Less than 12 Months, Fair Value | 5 | 62
Less than 12 Months, Unrealized Losses |  | (1)
12 Months or Longer, Fair Value | 12 | 5
Total, Fair Value | 17 | 67
Total, Unrealized Losses |  | (1)
Variable Interest Entity, Primary Beneficiary [Member] | Other Asset-Backed [Member] |  |
Less than 12 Months, Fair Value |  | 7
Total, Fair Value |  | 7
Residential Mortgage-Backed Agency [Member] | Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | Mortgage-backed Securities [Member] |  |
Less than 12 Months, Fair Value | 391 | 785
Less than 12 Months, Unrealized Losses | (4) | (11)
12 Months or Longer, Fair Value | 54 | 59
12 Months or Longer, Unrealized Losses | (1) | (2)
Total, Fair Value | 445 | 844
Total, Unrealized Losses | (5) | (13)
Commercial Mortgage-Backed [Member] | Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | Mortgage-backed Securities [Member] |  |
Less than 12 Months, Fair Value | 9 | 11
Less than 12 Months, Unrealized Losses | (1) |
12 Months or Longer, Fair Value | 51 | 85
12 Months or Longer, Unrealized Losses | (6) | (19)
Total, Fair Value | 60 | 96
Total, Unrealized Losses | (7) | (19)
Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | Mortgage-backed Securities [Member] | Residential Mortgage-Backed Non-Agency [Member] |  |
Less than 12 Months, Fair Value | 51 | 51
Less than 12 Months, Unrealized Losses | (3) | (2)
12 Months or Longer, Fair Value | 293 | 336
12 Months or Longer, Unrealized Losses | (111) | (178)
Total, Fair Value | 344 | 387
Total, Unrealized Losses | (114) | (180)
Mortgage-backed Securities [Member] |  |
Total, Fair Value | 849 |
Total, Unrealized Losses | 126 |
Collateralized Debt Obligations [Member] | Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | Asset-Backed Securities [Member] |  |
Less than 12 Months, Fair Value | 6 | 3
Less than 12 Months, Unrealized Losses | (2) |
12 Months or Longer, Fair Value | 252 | 278
12 Months or Longer, Unrealized Losses | (128) | (180)
Total, Fair Value | 258 | 281
Total, Unrealized Losses | (130) | (180)
Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | Asset-Backed Securities [Member] | Other Asset-Backed [Member] |  |
Less than 12 Months, Fair Value | 36 | 61
Less than 12 Months, Unrealized Losses | (1) | (2)
12 Months or Longer, Fair Value | 387 | 480
12 Months or Longer, Unrealized Losses | (120) | (110)
Total, Fair Value | 423 | 541
Total, Unrealized Losses | (121) | (112)
Asset-Backed Securities [Member] |  |
Total, Fair Value | 698 |
Total, Unrealized Losses | 251 |
Fixed-Maturity Investments [Member] | Taxable Bonds [Member] |  |
Less than 12 Months, Fair Value | 1,168 | 2,436
Less than 12 Months, Unrealized Losses | (27) | (58)
12 Months or Longer, Fair Value | 1,714 | 2,098
12 Months or Longer, Unrealized Losses | (456) | (629)
Total, Fair Value | 2,882 | 4,534
Total, Unrealized Losses | (483) | (687)
Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | U.S. Treasury and Government Agency [Member] |  |
Less than 12 Months, Fair Value | 30 | 370
Less than 12 Months, Unrealized Losses | (1) | (3)
Total, Fair Value | 30 | 370
Total, Unrealized Losses | (1) | (3)
Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | Foreign Governments [Member] |  |
Less than 12 Months, Fair Value | 17 | 33
Less than 12 Months, Unrealized Losses |  | (1)
Total, Fair Value | 17 | 33
Total, Unrealized Losses |  | (1)
Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | Corporate Obligations [Member] |  |
Less than 12 Months, Fair Value | 320 | 685
Less than 12 Months, Unrealized Losses | (6) | (13)
12 Months or Longer, Fair Value | 539 | 725
12 Months or Longer, Unrealized Losses | (67) | (114)
Total, Fair Value | 859 | 1,410
Total, Unrealized Losses | (73) | (127)
Fixed-Maturity Investments [Member] | Taxable Bonds [Member] | State and Municipal Bonds [Member] |  |
Less than 12 Months, Fair Value | 308 | 437
Less than 12 Months, Unrealized Losses | (9) | (26)
12 Months or Longer, Fair Value | 138 | 135
12 Months or Longer, Unrealized Losses | (23) | (26)
Total, Fair Value | 446 | 572
Total, Unrealized Losses | (32) | (52)
Fixed-Maturity Investments [Member] | Tax-Exempt Bonds [Member] |  |
Less than 12 Months, Fair Value | 1,190 | 2,002
Less than 12 Months, Unrealized Losses | (25) | (83)
12 Months or Longer, Fair Value | 190 | 181
12 Months or Longer, Unrealized Losses | (16) | (21)
Total, Fair Value | 1,380 | 2,183
Total, Unrealized Losses | (41) | (104)
Fixed-Maturity Investments [Member] | Tax-Exempt Bonds [Member] | State and Municipal Bonds [Member] |  |
Less than 12 Months, Fair Value | 1,190 | 2,002
Less than 12 Months, Unrealized Losses | (25) | (83)
12 Months or Longer, Fair Value | 190 | 181
12 Months or Longer, Unrealized Losses | (16) | (21)
Total, Fair Value | 1,380 | 2,183
Total, Unrealized Losses | (41) | (104)
Perpetual Preferred Securities [Member] | Other Investments: [Member] |  |
Less than 12 Months, Fair Value | 44 | 20
Less than 12 Months, Unrealized Losses | (1) |
12 Months or Longer, Fair Value | 89 | 140
12 Months or Longer, Unrealized Losses | (7) | (12)
Total, Fair Value | 133 | 160
Total, Unrealized Losses | (8) | (12)
Other Investments: [Member] |  |
Less than 12 Months, Fair Value | 44 | 23
Less than 12 Months, Unrealized Losses | (1) |
12 Months or Longer, Fair Value | 89 | 140
12 Months or Longer, Unrealized Losses | (7) | (12)
Total, Fair Value | 133 | 163
Total, Unrealized Losses | (8) | (12)
Other Investments: [Member] | Other Investments: [Member] |  |
Less than 12 Months, Fair Value |  | 3
Total, Fair Value |  | 3
Fixed-Maturity Investments [Member] |  |
Less than 12 Months, Fair Value | 2,358 | 4,438
Less than 12 Months, Unrealized Losses | (52) | (141)
12 Months or Longer, Fair Value | 1,904 | 2,279
12 Months or Longer, Unrealized Losses | (472) | (650)
Total, Fair Value | 4,262 | 6,717
Total, Unrealized Losses | $ (524) | $ (791)

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