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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)