XML 113 R63.htm IDEA: XBRL DOCUMENT v2.4.0.8
Fair Value (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities $ 9,557 $ 9,159  
Other investments:      
Contributions made to the funds 88.0 100.0 209.0
Distributions received from the funds 198.0 201.0 163.0
Fair value measurements on a recurring basis
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Total 12,875 11,704  
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 3,654 2,945  
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 9,057 8,553  
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 164 206  
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 576 507  
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 576 507  
Total 594 526  
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 526 452  
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 243 185  
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 282 261  
Indemnity | Fair value measurements on a recurring basis | Commercial mortgage-backed securities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities   3  
Indemnity | Fair value measurements on a recurring basis | Collateralized debt obligations
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 1 3  
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 25 29  
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 25 26  
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 18 19  
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 27 30  
Total 27 30  
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
      
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 | Collateralized debt obligations
      
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 | Nonredeemable preferred stock
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 2 4  
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 25 26  
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 547 473  
Total 547 473  
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 524 448  
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 243 185  
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 281 260  
Indemnity | Fair value measurements on a recurring basis | Level 2 | Commercial mortgage-backed securities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities   3  
Indemnity | Fair value measurements on a recurring basis | Level 2 | Collateralized debt obligations
      
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 | Nonredeemable preferred stock
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 23 25  
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 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 2 4  
Total 20 23  
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 2 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 1  
Indemnity | Fair value measurements on a recurring basis | Level 3 | Commercial mortgage-backed 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 | Collateralized debt obligations
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 1 3  
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 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 18 19  
Other investments:      
Contributions made to the funds 0 0.2  
Distributions received from the funds 2.4 0.3  
Unfunded commitments 1.5 1.5  
Exchange
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 8,981 8,652  
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 8,981 8,652  
Trading securities 3,202 2,417  
Total 12,281 11,178  
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 8,162 7,707  
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 172 191  
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 1,470 1,321  
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 15 16  
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 6,211 5,777  
Exchange | Fair value measurements on a recurring basis | Residential mortgage-backed securities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 156 231  
Exchange | Fair value measurements on a recurring basis | Commercial mortgage-backed securities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 47 67  
Exchange | Fair value measurements on a recurring basis | Collateralized debt obligations
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 16 49  
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 75 55  
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 621 631  
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 198 314  
Trading securities 3,202 2,417  
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 98 109  
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 440 513  
Trading securities 3,187 2,402  
Total 3,627 2,915  
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 0  
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 0  
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 0  
Exchange | Fair value measurements on a recurring basis | Level 1 | Residential mortgage-backed 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 | Commercial mortgage-backed 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 | Collateralized debt obligations
      
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 242 199  
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 198 314  
Trading securities 3,187 2,402  
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 8,510 8,080  
Trading securities 0 0  
Total 8,510 8,080  
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 8,131 7,648  
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 172 191  
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 1,470 1,321  
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 15 16  
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 6,185 5,734  
Exchange | Fair value measurements on a recurring basis | Level 2 | Residential mortgage-backed securities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 156 231  
Exchange | Fair value measurements on a recurring basis | Level 2 | Commercial mortgage-backed securities
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 47 67  
Exchange | Fair value measurements on a recurring basis | Level 2 | Collateralized debt obligations
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 11 33  
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 75 55  
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 379 432  
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 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 31 59  
Trading securities 15 15  
Total 144 183  
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 31 59  
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 0  
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 26 43  
Exchange | Fair value measurements on a recurring basis | Level 3 | Residential mortgage-backed 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 | Commercial mortgage-backed 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 | Collateralized debt obligations
      
Consolidated fair value measurements on a recurring basis by asset class and level of input      
Available-for-sale securities 5 16  
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 0  
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 0  
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 0  
Trading securities 15 15  
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 98 109  
Other investments:      
Contributions made to the funds 0 0.7  
Distributions received from the funds 21.7 4.7  
Unfunded commitments $ 4.5 $ 4.5