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Investments (Available-For-Sale Securities Continuous Unrealized Loss Position) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | $ 912 | $ 4,530
Less than 12 Months, Unrealized Losses | (36) | (142)
12 Months or Longer, Fair Value | 1,475 | 2,424
12 Months or Longer, Unrealized Losses | (442) | (662)
Total, Fair Value | 2,387 | 6,954
Total, Unrealized Losses | (478) | (804)
Fixed-Maturity Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 820 | 4,438
Less than 12 Months, Unrealized Losses | (33) | (141)
12 Months or Longer, Fair Value | 1,252 | 2,279
12 Months or Longer, Unrealized Losses | (385) | (650)
Total, Fair Value | 2,072 | 6,717
Total, Unrealized Losses | (418) | (791)
Other Long Term Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 47 | 23
Less than 12 Months, Unrealized Losses | (3) |
12 Months or Longer, Fair Value | 45 | 140
12 Months or Longer, Unrealized Losses | (16) | (12)
Total, Fair Value | 92 | 163
Total, Unrealized Losses | (19) | (12)
Perpetual Preferred Securities [Member] | Other Long Term Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 47 | 20
Less than 12 Months, Unrealized Losses | (3) |
12 Months or Longer, Fair Value | 45 | 140
12 Months or Longer, Unrealized Losses | (16) | (12)
Total, Fair Value | 92 | 160
Total, Unrealized Losses | (19) | (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
Taxable Bonds [Member] | Fixed-Maturity Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 806 | 2,436
Less than 12 Months, Unrealized Losses | (33) | (58)
12 Months or Longer, Fair Value | 1,177 | 2,098
12 Months or Longer, Unrealized Losses | (383) | (629)
Total, Fair Value | 1,983 | 4,534
Total, Unrealized Losses | (416) | (687)
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 | 200 | 370
Less than 12 Months, Unrealized Losses |  | (3)
Total, Fair Value | 200 | 370
Total, Unrealized Losses |  | (3)
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 | 20 | 33
Less than 12 Months, Unrealized Losses |  | (1)
Total, Fair Value | 20 | 33
Total, Unrealized Losses |  | (1)
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 | 297 | 685
Less than 12 Months, Unrealized Losses | (15) | (13)
12 Months or Longer, Fair Value | 418 | 725
12 Months or Longer, Unrealized Losses | (91) | (114)
Total, Fair Value | 715 | 1,410
Total, Unrealized Losses | (106) | (127)
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 | 152 | 437
Less than 12 Months, Unrealized Losses | (2) | (26)
12 Months or Longer, Fair Value | 76 | 135
12 Months or Longer, Unrealized Losses | (15) | (26)
Total, Fair Value | 228 | 572
Total, Unrealized Losses | (17) | (52)
Tax-Exempt Bonds [Member] | Fixed-Maturity Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less than 12 Months, Fair Value | 14 | 2,002
Less than 12 Months, Unrealized Losses |  | (83)
12 Months or Longer, Fair Value | 75 | 181
12 Months or Longer, Unrealized Losses | (2) | (21)
Total, Fair Value | 89 | 2,183
Total, Unrealized Losses | (2) | (104)
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 | 14 | 2,002
Less than 12 Months, Unrealized Losses |  | (83)
12 Months or Longer, Fair Value | 75 | 181
12 Months or Longer, Unrealized Losses | (2) | (21)
Total, Fair Value | 89 | 2,183
Total, Unrealized Losses | (2) | (104)
Mortgage-Backed Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total, Fair Value | 401 |
Total, Unrealized Losses | (119) |
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 | 20 | 785
Less than 12 Months, Unrealized Losses |  | (11)
12 Months or Longer, Fair Value | 49 | 59
12 Months or Longer, Unrealized Losses |  | (2)
Total, Fair Value | 69 | 844
Total, Unrealized Losses |  | (13)
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 | 34 | 51
Less than 12 Months, Unrealized Losses | (5) | (2)
12 Months or Longer, Fair Value | 167 | 336
12 Months or Longer, Unrealized Losses | (78) | (178)
Total, Fair Value | 201 | 387
Total, Unrealized Losses | (83) | (180)
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 | 17 | 11
Less than 12 Months, Unrealized Losses | (2) |
12 Months or Longer, Fair Value | 22 | 85
12 Months or Longer, Unrealized Losses | (8) | (19)
Total, Fair Value | 39 | 96
Total, Unrealized Losses | (10) | (19)
Asset-Backed Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total, Fair Value | 639 |
Total, Unrealized Losses | (215) |
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 | 13 | 3
Less than 12 Months, Unrealized Losses | (2) |
12 Months or Longer, Fair Value | 117 | 278
12 Months or Longer, Unrealized Losses | (116) | (180)
Total, Fair Value | 130 | 281
Total, Unrealized Losses | (118) | (180)
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 | 53 | 61
Less than 12 Months, Unrealized Losses | (7) | (2)
12 Months or Longer, Fair Value | 328 | 480
12 Months or Longer, Unrealized Losses | (75) | (110)
Total, Fair Value | 381 | 541
Total, Unrealized Losses | (82) | (112)
Variable Interest Entities [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 Entities [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 |
12 Months or Longer, Fair Value | 90 |
12 Months or Longer, Unrealized Losses | (26) |
Total, Fair Value | 93 |
Total, Unrealized Losses | (26) |
Variable Interest Entities [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 | 62
Less than 12 Months, Unrealized Losses |  | (1)
12 Months or Longer, Fair Value | 88 | 5
12 Months or Longer, Unrealized Losses | (15) |
Total, Fair Value | 97 | 67
Total, Unrealized Losses | (15) | (1)
Variable Interest Entities [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 | 7
Total, Fair Value | $ 31 | $ 7

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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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- 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 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 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 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 + Details
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