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Investments (Available For Sale Securities Continuous Unrealized Loss Position) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | $ 1,185 | $ 912
Less than 12 Months, Unrealized Losses | (21) | (36)
12 Months or Longer, Fair Value | 907 | 1,475
12 Months or Longer, Unrealized Losses | (257) | (442)
Total, Fair Value | 2,092 | 2,387
Total, Unrealized Losses | (278) | (478)
Fixed-Maturity Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 1,128 | 820
Less than 12 Months, Unrealized Losses | (21) | (33)
12 Months or Longer, Fair Value | 725 | 1,252
12 Months or Longer, Unrealized Losses | (226) | (385)
Total, Fair Value | 1,853 | 2,072
Total, Unrealized Losses | (247) | (418)
Total Other Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 45 | 47
Less than 12 Months, Unrealized Losses |  | (3)
12 Months or Longer, Fair Value |  | 45
12 Months or Longer, Unrealized Losses |  | (16)
Total, Fair Value | 45 | 92
Total, Unrealized Losses |  | (19)
Perpetual Preferred Securities [Member] | Total Other Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 45 | 47
Less than 12 Months, Unrealized Losses |  | (3)
12 Months or Longer, Fair Value |  | 45
12 Months or Longer, Unrealized Losses |  | (16)
Total, Fair Value | 45 | 92
Total, Unrealized Losses |  | (19)
Taxable Bonds [Member] | Fixed-Maturity Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 1,115 | 806
Less than 12 Months, Unrealized Losses | (21) | (33)
12 Months or Longer, Fair Value | 701 | 1,177
12 Months or Longer, Unrealized Losses | (225) | (383)
Total, Fair Value | 1,816 | 1,983
Total, Unrealized Losses | (246) | (416)
Taxable Bonds [Member] | U.S. Treasury And Government Agency [Member] | Fixed-Maturity Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 587 | 200
Less than 12 Months, Unrealized Losses | (4) |
Total, Fair Value | 587 | 200
Total, Unrealized Losses | (4) |
Taxable Bonds [Member] | Foreign Governments [Member] | Fixed-Maturity Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 22 | 20
12 Months or Longer, Fair Value | 1 |
Total, Fair Value | 23 | 20
Taxable Bonds [Member] | Corporate Obligations [Member] | Fixed-Maturity Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 300 | 297
Less than 12 Months, Unrealized Losses | (9) | (15)
12 Months or Longer, Fair Value | 195 | 418
12 Months or Longer, Unrealized Losses | (28) | (91)
Total, Fair Value | 495 | 715
Total, Unrealized Losses | (37) | (106)
Taxable Bonds [Member] | State And Municipal Bonds [Member] | Fixed-Maturity Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 145 | 152
Less than 12 Months, Unrealized Losses | (4) | (2)
12 Months or Longer, Fair Value | 70 | 76
12 Months or Longer, Unrealized Losses | (16) | (15)
Total, Fair Value | 215 | 228
Total, Unrealized Losses | (20) | (17)
Tax-Exempt Bonds [Member] | State And Municipal Bonds [Member] | Fixed-Maturity Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 13 | 14
12 Months or Longer, Fair Value | 24 | 75
12 Months or Longer, Unrealized Losses | (1) | (2)
Total, Fair Value | 37 | 89
Total, Unrealized Losses | (1) | (2)
Mortgage-Backed Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total, Fair Value | 360 |
Total, Unrealized Losses | (91) |
Mortgage-Backed Securities [Member] | Taxable Bonds [Member] | Residential Mortgage-Backed Securities [Member] | Fixed-Maturity Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 13 | 20
12 Months or Longer, Fair Value | 46 | 49
Total, Fair Value | 59 | 69
Mortgage-Backed Securities [Member] | Taxable Bonds [Member] | Residential Mortgage-Backed Non-Agency [Member] | Fixed-Maturity Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 22 | 34
Less than 12 Months, Unrealized Losses | (4) | (5)
12 Months or Longer, Fair Value | 148 | 167
12 Months or Longer, Unrealized Losses | (61) | (78)
Total, Fair Value | 170 | 201
Total, Unrealized Losses | (65) | (83)
Mortgage-Backed Securities [Member] | Taxable Bonds [Member] | Commercial Mortgage-Backed [Member] | Fixed-Maturity Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 12 | 17
Less than 12 Months, Unrealized Losses |  | (2)
12 Months or Longer, Fair Value | 24 | 22
12 Months or Longer, Unrealized Losses | (7) | (8)
Total, Fair Value | 36 | 39
Total, Unrealized Losses | (7) | (10)
Asset-Backed Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total, Fair Value | 330 |
Total, Unrealized Losses | 125 |
Asset-Backed Securities [Member] | Taxable Bonds [Member] | Collateralized Debt Obligations [Member] | Fixed-Maturity Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 8 | 13
Less than 12 Months, Unrealized Losses |  | (2)
12 Months or Longer, Fair Value | 93 | 117
12 Months or Longer, Unrealized Losses | (94) | (116)
Total, Fair Value | 101 | 130
Total, Unrealized Losses | (94) | (118)
Asset-Backed Securities [Member] | Taxable Bonds [Member] | Other Asset-Backed [Member] | Fixed-Maturity Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 6 | 53
Less than 12 Months, Unrealized Losses |  | (7)
12 Months or Longer, Fair Value | 124 | 328
12 Months or Longer, Unrealized Losses | (19) | (75)
Total, Fair Value | 130 | 381
Total, Unrealized Losses | (19) | (82)
Variable Interest Entity [Member] | Corporate Obligations [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value |  | 2
Total, Fair Value |  | 2
Variable Interest Entity [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 | 3 | 3
12 Months or Longer, Fair Value | 92 | 90
12 Months or Longer, Unrealized Losses | (19) | (26)
Total, Fair Value | 95 | 93
Total, Unrealized Losses | (19) | (26)
Variable Interest Entity [Member] | Asset-Backed Securities [Member] | Collateralized Debt Obligations [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 9 | 9
12 Months or Longer, Fair Value | 90 | 88
12 Months or Longer, Unrealized Losses | (12) | (15)
Total, Fair Value | 99 | 97
Total, Unrealized Losses | (12) | (15)
Variable Interest Entity [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 |  | 31
Total, Fair Value |  | $ 31

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