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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 Value1,7202,424
12 Months or Longer, Unrealized Losses(530)(662)
Total, Fair Value2,5496,954
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 Value6962
Less than 12 Months, Unrealized Losses(1)(1)
12 Months or Longer, Fair Value1025
12 Months or Longer, Unrealized Losses(13) 
Total, Fair Value17167
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 Value4 
12 Months or Longer, Fair Value93 
12 Months or Longer, Unrealized Losses(28) 
Total, Fair Value97 
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 Value87
Total, Fair Value87
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 Value22785
Less than 12 Months, Unrealized Losses (11)
12 Months or Longer, Fair Value5159
12 Months or Longer, Unrealized Losses (2)
Total, Fair Value73844
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 Value1811
Less than 12 Months, Unrealized Losses(2) 
12 Months or Longer, Fair Value2485
12 Months or Longer, Unrealized Losses(6)(19)
Total, Fair Value4296
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 Value450 
Total, Unrealized Losses121 
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 Value143
Less than 12 Months, Unrealized Losses(2) 
12 Months or Longer, Fair Value130278
12 Months or Longer, Unrealized Losses(121)(180)
Total, Fair Value144281
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 Value8261
Less than 12 Months, Unrealized Losses(12)(2)
12 Months or Longer, Fair Value318480
12 Months or Longer, Unrealized Losses(136)(110)
Total, Fair Value400541
Total, Unrealized Losses(148)(112)
Asset-Backed Securities [Member]
  
Schedule of Trading Securities and Other Trading Assets [Line Items]  
Total, Fair Value723 
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 Value5172,436
Less than 12 Months, Unrealized Losses(29)(58)
12 Months or Longer, Fair Value1,2802,098
12 Months or Longer, Unrealized Losses(455)(629)
Total, Fair Value1,7974,534
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 Value16370
Less than 12 Months, Unrealized Losses (3)
Total, Fair Value16370
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 Value3133
Less than 12 Months, Unrealized Losses (1)
Total, Fair Value3133
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 Value277685
Less than 12 Months, Unrealized Losses(8)(13)
12 Months or Longer, Fair Value497725
12 Months or Longer, Unrealized Losses(101)(114)
Total, Fair Value7741,410
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 Value79135
12 Months or Longer, Unrealized Losses(11)(26)
Total, Fair Value79572
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 Value1822,002
Less than 12 Months, Unrealized Losses(3)(83)
12 Months or Longer, Fair Value162181
12 Months or Longer, Unrealized Losses(7)(21)
Total, Fair Value3442,183
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 Value1822,002
Less than 12 Months, Unrealized Losses(3)(83)
12 Months or Longer, Fair Value162181
12 Months or Longer, Unrealized Losses(7)(21)
Total, Fair Value3442,183
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 Value4920
Less than 12 Months, Unrealized Losses(4) 
12 Months or Longer, Fair Value83140
12 Months or Longer, Unrealized Losses(27)(12)
Total, Fair Value132160
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 Value4923
Less than 12 Months, Unrealized Losses(4) 
12 Months or Longer, Fair Value83140
12 Months or Longer, Unrealized Losses(27)(12)
Total, Fair Value132163
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 Value6994,438
Less than 12 Months, Unrealized Losses(32)(141)
12 Months or Longer, Fair Value1,4422,279
12 Months or Longer, Unrealized Losses(462)(650)
Total, Fair Value2,1416,717
Total, Unrealized Losses$ (494)$ (791)