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Fair Value (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities $ 9,159 $ 8,429  
Other investments:      
Contributions made to the funds 100.0 209.0 165.0
Distributions received from the funds 201.0 163.0 142.0
Fair value measurements on a recurring basis
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Total 11,704 10,883  
Fair value measurements on a recurring basis | Level 1
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Total 2,945 2,547  
Fair value measurements on a recurring basis | Level 2
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Total 8,553 8,146  
Fair value measurements on a recurring basis | Level 3
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Total 206 190  
Fair value measurements on a recurring basis | Level 3 | Real estate
      
Other investments:      
Number of real estate funds reported under fair value option 4 4  
Fair value measurements on a recurring basis | Level 3 | Real estate | Minimum
      
Other investments:      
Underlying assets, liquidation period from inception of fund 5 years 5 years  
Fair value measurements on a recurring basis | Level 3 | Real estate | Maximum
      
Other investments:      
Underlying assets, liquidation period from inception of fund 10 years 10 years  
Indemnity
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 507 573  
Indemnity | Fair value measurements on a recurring basis
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 507 573  
Trading securities   27  
Total 526 617  
Indemnity | Fair value measurements on a recurring basis | Fixed maturities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 452 548  
Indemnity | Fair value measurements on a recurring basis | States & political subdivisions
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 185 221  
Indemnity | Fair value measurements on a recurring basis | Corporate debt securities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 261 303  
Indemnity | Fair value measurements on a recurring basis | Commercial mortgage-backed securities (CMBS)
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 3 13  
Indemnity | Fair value measurements on a recurring basis | Collateralized debt obligations (CDO)
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 3 4  
Indemnity | Fair value measurements on a recurring basis | Other debt securities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities   7  
Indemnity | Fair value measurements on a recurring basis | Nonredeemable preferred stock
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 29 25  
Indemnity | Fair value measurements on a recurring basis | Common stock
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 26    
Trading securities   27  
Indemnity | Fair value measurements on a recurring basis | Real estate
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Other investments 19 17  
Indemnity | Fair value measurements on a recurring basis | Level 1
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 30 10  
Trading securities   27  
Total 30 37  
Indemnity | Fair value measurements on a recurring basis | Level 1 | Fixed maturities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0 0  
Indemnity | Fair value measurements on a recurring basis | Level 1 | States & political subdivisions
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0 0  
Indemnity | Fair value measurements on a recurring basis | Level 1 | Corporate debt securities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0 0  
Indemnity | Fair value measurements on a recurring basis | Level 1 | Commercial mortgage-backed securities (CMBS)
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0 0  
Indemnity | Fair value measurements on a recurring basis | Level 1 | Collateralized debt obligations (CDO)
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0 0  
Indemnity | Fair value measurements on a recurring basis | Level 1 | Other debt securities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities   0  
Indemnity | Fair value measurements on a recurring basis | Level 1 | Nonredeemable preferred stock
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 4 10  
Indemnity | Fair value measurements on a recurring basis | Level 1 | Common stock
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 26    
Trading securities   27  
Indemnity | Fair value measurements on a recurring basis | Level 1 | Real estate
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Other investments 0 0  
Indemnity | Fair value measurements on a recurring basis | Level 2
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 473 559  
Trading securities   0  
Total 473 559  
Indemnity | Fair value measurements on a recurring basis | Level 2 | Fixed maturities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 448 544  
Indemnity | Fair value measurements on a recurring basis | Level 2 | States & political subdivisions
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 185 221  
Indemnity | Fair value measurements on a recurring basis | Level 2 | Corporate debt securities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 260 303  
Indemnity | Fair value measurements on a recurring basis | Level 2 | Commercial mortgage-backed securities (CMBS)
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 3 13  
Indemnity | Fair value measurements on a recurring basis | Level 2 | Collateralized debt obligations (CDO)
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0 0  
Indemnity | Fair value measurements on a recurring basis | Level 2 | Other debt securities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities   7  
Indemnity | Fair value measurements on a recurring basis | Level 2 | Nonredeemable preferred stock
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 25 15  
Indemnity | Fair value measurements on a recurring basis | Level 2 | Common stock
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0    
Trading securities   0  
Indemnity | Fair value measurements on a recurring basis | Level 2 | Real estate
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Other investments 0 0  
Indemnity | Fair value measurements on a recurring basis | Level 3
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 4 4  
Trading securities   0  
Total 23 21  
Indemnity | Fair value measurements on a recurring basis | Level 3 | Fixed maturities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 4 4  
Indemnity | Fair value measurements on a recurring basis | Level 3 | States & political subdivisions
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0 0  
Indemnity | Fair value measurements on a recurring basis | Level 3 | Corporate debt securities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 1 0  
Indemnity | Fair value measurements on a recurring basis | Level 3 | Commercial mortgage-backed securities (CMBS)
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0 0  
Indemnity | Fair value measurements on a recurring basis | Level 3 | Collateralized debt obligations (CDO)
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 3 4  
Indemnity | Fair value measurements on a recurring basis | Level 3 | Other debt securities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities   0  
Indemnity | Fair value measurements on a recurring basis | Level 3 | Nonredeemable preferred stock
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0 0  
Indemnity | Fair value measurements on a recurring basis | Level 3 | Common stock
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0    
Trading securities   0  
Indemnity | Fair value measurements on a recurring basis | Level 3 | Real estate
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Other investments 19 17  
Other investments:      
Contributions made to the funds 0.2 1.0  
Distributions received from the funds 0.3 0.2  
Unfunded commitments 1.5 1.7  
Exchange
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 8,652 7,856  
Exchange | Fair value measurements on a recurring basis
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 8,652 7,856  
Trading securities 2,417 2,308  
Total 11,178 10,266  
Exchange | Fair value measurements on a recurring basis | Fixed maturities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 7,707 7,292  
Exchange | Fair value measurements on a recurring basis | U.S. government & agencies
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 191 17  
Exchange | Fair value measurements on a recurring basis | States & political subdivisions
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 1,321 1,379  
Exchange | Fair value measurements on a recurring basis | Foreign government securities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 16 15  
Exchange | Fair value measurements on a recurring basis | Corporate debt securities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 5,777 5,499  
Exchange | Fair value measurements on a recurring basis | Residential mortgage-backed securities (RMBS)
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 231 189  
Exchange | Fair value measurements on a recurring basis | Commercial mortgage-backed securities (CMBS)
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 67 66  
Exchange | Fair value measurements on a recurring basis | Collateralized debt obligations (CDO)
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 49 65  
Exchange | Fair value measurements on a recurring basis | Other debt securities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 55 62  
Exchange | Fair value measurements on a recurring basis | Nonredeemable preferred stock
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 631 564  
Exchange | Fair value measurements on a recurring basis | Common stock
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 314    
Trading securities 2,417 2,308  
Exchange | Fair value measurements on a recurring basis | Real estate
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Other investments 109 102  
Exchange | Fair value measurements on a recurring basis | Level 1
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 513 214  
Trading securities 2,402 2,296  
Total 2,915 2,510  
Exchange | Fair value measurements on a recurring basis | Level 1 | Fixed maturities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0 26  
Exchange | Fair value measurements on a recurring basis | Level 1 | U.S. government & agencies
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0 6  
Exchange | Fair value measurements on a recurring basis | Level 1 | States & political subdivisions
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0 0  
Exchange | Fair value measurements on a recurring basis | Level 1 | Foreign government securities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0 0  
Exchange | Fair value measurements on a recurring basis | Level 1 | Corporate debt securities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0 20  
Exchange | Fair value measurements on a recurring basis | Level 1 | Residential mortgage-backed securities (RMBS)
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0 0  
Exchange | Fair value measurements on a recurring basis | Level 1 | Commercial mortgage-backed securities (CMBS)
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0 0  
Exchange | Fair value measurements on a recurring basis | Level 1 | Collateralized debt obligations (CDO)
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0 0  
Exchange | Fair value measurements on a recurring basis | Level 1 | Other debt securities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0 0  
Exchange | Fair value measurements on a recurring basis | Level 1 | Nonredeemable preferred stock
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 199 188  
Exchange | Fair value measurements on a recurring basis | Level 1 | Common stock
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 314    
Trading securities 2,402 2,296  
Exchange | Fair value measurements on a recurring basis | Level 1 | Real estate
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Other investments 0 0  
Exchange | Fair value measurements on a recurring basis | Level 2
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 8,080 7,587  
Trading securities 0 0  
Total 8,080 7,587  
Exchange | Fair value measurements on a recurring basis | Level 2 | Fixed maturities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 7,648 7,216  
Exchange | Fair value measurements on a recurring basis | Level 2 | U.S. government & agencies
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 191 11  
Exchange | Fair value measurements on a recurring basis | Level 2 | States & political subdivisions
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 1,321 1,375  
Exchange | Fair value measurements on a recurring basis | Level 2 | Foreign government securities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 16 15  
Exchange | Fair value measurements on a recurring basis | Level 2 | Corporate debt securities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 5,734 5,467  
Exchange | Fair value measurements on a recurring basis | Level 2 | Residential mortgage-backed securities (RMBS)
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 231 189  
Exchange | Fair value measurements on a recurring basis | Level 2 | Commercial mortgage-backed securities (CMBS)
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 67 66  
Exchange | Fair value measurements on a recurring basis | Level 2 | Collateralized debt obligations (CDO)
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 33 36  
Exchange | Fair value measurements on a recurring basis | Level 2 | Other debt securities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 55 57  
Exchange | Fair value measurements on a recurring basis | Level 2 | Nonredeemable preferred stock
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 432 371  
Exchange | Fair value measurements on a recurring basis | Level 2 | Common stock
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0    
Trading securities 0 0  
Exchange | Fair value measurements on a recurring basis | Level 2 | Real estate
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Other investments 0 0  
Exchange | Fair value measurements on a recurring basis | Level 3
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 59 55  
Trading securities 15 12  
Total 183 169  
Exchange | Fair value measurements on a recurring basis | Level 3 | Fixed maturities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 59 50  
Exchange | Fair value measurements on a recurring basis | Level 3 | U.S. government & agencies
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0 0  
Exchange | Fair value measurements on a recurring basis | Level 3 | States & political subdivisions
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0 4  
Exchange | Fair value measurements on a recurring basis | Level 3 | Foreign government securities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0 0  
Exchange | Fair value measurements on a recurring basis | Level 3 | Corporate debt securities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 43 12  
Exchange | Fair value measurements on a recurring basis | Level 3 | Residential mortgage-backed securities (RMBS)
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0 0  
Exchange | Fair value measurements on a recurring basis | Level 3 | Commercial mortgage-backed securities (CMBS)
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0 0  
Exchange | Fair value measurements on a recurring basis | Level 3 | Collateralized debt obligations (CDO)
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 16 29  
Exchange | Fair value measurements on a recurring basis | Level 3 | Other debt securities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0 5  
Exchange | Fair value measurements on a recurring basis | Level 3 | Nonredeemable preferred stock
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0 5  
Exchange | Fair value measurements on a recurring basis | Level 3 | Common stock
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 0    
Trading securities 15 12  
Exchange | Fair value measurements on a recurring basis | Level 3 | Real estate
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Other investments 109 102  
Other investments:      
Contributions made to the funds 0.7 11.5  
Distributions received from the funds 4.7 2.5  
Unfunded commitments $ 4.5 $ 5.2