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Fair Value (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Mar. 31, 2014
Fair value measurements on a recurring basis
Dec. 31, 2013
Fair value measurements on a recurring basis
Mar. 31, 2014
Fair value measurements on a recurring basis
Level 1
Dec. 31, 2013
Fair value measurements on a recurring basis
Level 1
Mar. 31, 2014
Fair value measurements on a recurring basis
Level 2
Dec. 31, 2013
Fair value measurements on a recurring basis
Level 2
Mar. 31, 2014
Fair value measurements on a recurring basis
Level 3
Dec. 31, 2013
Fair value measurements on a recurring basis
Level 3
Mar. 31, 2014
Fair value measurements on a recurring basis
Level 3
Real estate
fund
Dec. 31, 2013
Fair value measurements on a recurring basis
Level 3
Real estate
fund
Mar. 31, 2014
Indemnity
Dec. 31, 2013
Indemnity
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Fixed maturities
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Fixed maturities
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
States & political subdivisions
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
States & political subdivisions
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Corporate debt securities
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Corporate debt securities
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Collateralized debt obligations
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Collateralized debt obligations
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Nonredeemable preferred stock
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Nonredeemable preferred stock
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Common stock
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Common stock
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Real estate
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Real estate
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Level 1
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Level 1
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Level 1
Fixed maturities
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Level 1
Fixed maturities
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Level 1
States & political subdivisions
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Level 1
States & political subdivisions
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Level 1
Corporate debt securities
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Level 1
Corporate debt securities
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Level 1
Collateralized debt obligations
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Level 1
Collateralized debt obligations
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Level 1
Nonredeemable preferred stock
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Level 1
Nonredeemable preferred stock
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Level 1
Common stock
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Level 1
Common stock
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Level 1
Real estate
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Level 1
Real estate
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Level 2
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Level 2
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Level 2
Fixed maturities
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Level 2
Fixed maturities
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Level 2
States & political subdivisions
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Level 2
States & political subdivisions
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Level 2
Corporate debt securities
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Level 2
Corporate debt securities
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Level 2
Collateralized debt obligations
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Level 2
Collateralized debt obligations
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Level 2
Nonredeemable preferred stock
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Level 2
Nonredeemable preferred stock
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Level 2
Common stock
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Level 2
Common stock
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Level 2
Real estate
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Level 2
Real estate
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Level 3
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Level 3
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Level 3
Fixed maturities
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Level 3
Fixed maturities
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Level 3
States & political subdivisions
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Level 3
States & political subdivisions
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Level 3
Corporate debt securities
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Level 3
Corporate debt securities
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Level 3
Collateralized debt obligations
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Level 3
Collateralized debt obligations
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Level 3
Nonredeemable preferred stock
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Level 3
Nonredeemable preferred stock
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Level 3
Common stock
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Level 3
Common stock
Mar. 31, 2014
Indemnity
Fair value measurements on a recurring basis
Level 3
Real estate
Dec. 31, 2013
Indemnity
Fair value measurements on a recurring basis
Level 3
Real estate
Mar. 31, 2014
Exchange
Dec. 31, 2013
Exchange
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Fixed maturities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Fixed maturities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
U.S. government & agencies
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
U.S. treasury
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Government sponsored enterprises
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
States & political subdivisions
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
States & political subdivisions
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Foreign government securities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Foreign government securities
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Corporate debt securities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Corporate debt securities
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Residential mortgage-backed securities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Residential mortgage-backed securities
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Commercial mortgage-backed securities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Commercial mortgage-backed securities
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Collateralized debt obligations
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Collateralized debt obligations
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Other debt securities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Other debt securities
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Nonredeemable preferred stock
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Nonredeemable preferred stock
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Common stock
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Common stock
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Real estate
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Real estate
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 1
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 1
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 1
Fixed maturities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 1
Fixed maturities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 1
U.S. government & agencies
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 1
U.S. treasury
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 1
Government sponsored enterprises
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 1
States & political subdivisions
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 1
States & political subdivisions
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 1
Foreign government securities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 1
Foreign government securities
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 1
Corporate debt securities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 1
Corporate debt securities
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 1
Residential mortgage-backed securities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 1
Residential mortgage-backed securities
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 1
Commercial mortgage-backed securities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 1
Commercial mortgage-backed securities
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 1
Collateralized debt obligations
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 1
Collateralized debt obligations
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 1
Other debt securities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 1
Other debt securities
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 1
Nonredeemable preferred stock
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 1
Nonredeemable preferred stock
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 1
Common stock
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 1
Common stock
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 1
Real estate
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 1
Real estate
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 2
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 2
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 2
Fixed maturities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 2
Fixed maturities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 2
U.S. government & agencies
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 2
U.S. treasury
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 2
Government sponsored enterprises
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 2
States & political subdivisions
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 2
States & political subdivisions
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 2
Foreign government securities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 2
Foreign government securities
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 2
Corporate debt securities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 2
Corporate debt securities
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 2
Residential mortgage-backed securities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 2
Residential mortgage-backed securities
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 2
Commercial mortgage-backed securities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 2
Commercial mortgage-backed securities
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 2
Collateralized debt obligations
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 2
Collateralized debt obligations
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 2
Other debt securities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 2
Other debt securities
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 2
Nonredeemable preferred stock
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 2
Nonredeemable preferred stock
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 2
Common stock
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 2
Common stock
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 2
Real estate
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 2
Real estate
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 3
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 3
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 3
Fixed maturities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 3
Fixed maturities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 3
U.S. government & agencies
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 3
U.S. treasury
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 3
Government sponsored enterprises
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 3
States & political subdivisions
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 3
States & political subdivisions
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 3
Foreign government securities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 3
Foreign government securities
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 3
Corporate debt securities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 3
Corporate debt securities
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 3
Residential mortgage-backed securities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 3
Residential mortgage-backed securities
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 3
Commercial mortgage-backed securities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 3
Commercial mortgage-backed securities
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 3
Collateralized debt obligations
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 3
Collateralized debt obligations
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 3
Other debt securities
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 3
Other debt securities
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 3
Nonredeemable preferred stock
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 3
Nonredeemable preferred stock
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 3
Common stock
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 3
Common stock
Mar. 31, 2014
Exchange
Fair value measurements on a recurring basis
Level 3
Real estate
Dec. 31, 2013
Exchange
Fair value measurements on a recurring basis
Level 3
Real estate
Mar. 31, 2014
Minimum
Fair value measurements on a recurring basis
Level 3
Real estate
Dec. 31, 2013
Minimum
Fair value measurements on a recurring basis
Level 3
Real estate
Mar. 31, 2014
Maximum
Fair value measurements on a recurring basis
Level 3
Real estate
Dec. 31, 2013
Maximum
Fair value measurements on a recurring basis
Level 3
Real estate
Fair value measurements on a recurring basis by asset class and level of input                                                                                                                                                                                                                                                                                                                                                                                                  
Available-for-sale securities $ 9,768   $ 9,557                     $ 537 $ 576 $ 537 $ 576 $ 502 $ 526 $ 241 $ 243 $ 261 $ 282 $ 0 $ 1 $ 15 $ 25 $ 20 $ 25     $ 22 $ 27 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 2 $ 2 $ 20 $ 25     $ 514 $ 547 $ 501 $ 524 $ 241 $ 243 $ 260 $ 281 $ 0 $ 0 $ 13 $ 23 $ 0 $ 0     $ 1 $ 2 $ 1 $ 2 $ 0 $ 0 $ 1 $ 1 $ 0 $ 1 $ 0 $ 0 $ 0 $ 0     $ 9,231 $ 8,981 $ 9,231 $ 8,981 $ 8,379 $ 8,162 $ 172 $ 66 $ 38 $ 1,485 $ 1,470 $ 15 $ 15 $ 6,494 $ 6,211 $ 151 $ 156 $ 44 $ 47 $ 14 $ 16 $ 72 $ 75 $ 656 $ 621 $ 196 $ 198     $ 469 $ 440 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 273 $ 242 $ 196 $ 198     $ 8,735 $ 8,510 $ 8,353 $ 8,131 $ 172 $ 66 $ 38 $ 1,485 $ 1,470 $ 15 $ 15 $ 6,468 $ 6,185 $ 151 $ 156 $ 44 $ 47 $ 14 $ 11 $ 72 $ 75 $ 382 $ 379 $ 0 $ 0     $ 27 $ 31 $ 26 $ 31 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 26 $ 26 $ 0 $ 0 $ 0 $ 0 $ 0 $ 5 $ 0 $ 0 $ 1 $ 0 $ 0 $ 0            
Trading securities                                                                                                                                                                   3,253 3,202                                           3,253 3,202     3,238 3,187                                           3,238 3,187     0 0                                           0 0     15 15                                           15 15            
Other investments                                                           18 18                             0 0                             0 0                             18 18                                                       98 98                                                   0 0                                                   0 0                                                   98 98        
Total       13,137 12,875 3,729 3,654 9,249 9,057 159 164         555 594                             22 27                             514 547                             19 20                                 12,582 12,281                                                   3,707 3,627                                                   8,735 8,510                                                   140 144                                                          
Other investments:                                                                                                                                                                                                                                                                                                                                                                                                  
Number of real estate funds reported under fair value option                       4 4                                                                                                                                                                                                                                                                                                                                                                        
Underlying assets, liquidation period from inception of fund                                                                                                                                                                                                                                                                                                                                                                                           5 years 5 years 10 years 10 years
Contributions made to the funds 27.0 23.0                                                                                                                                                       0 0                                                                                                                                                                                                                         0 0        
Distributions received from the funds 41.0 53.0                                                                                                                                                       1.3 2.4                                                                                                                                                                                                                         4.8 21.7        
Unfunded commitments                                                                                                                                                           $ 1.5 $ 1.5                                                                                                                                                                                                                         $ 4.5 $ 4.5