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Investments (details) - Investment Information (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Investment disclosure details      
Fixed maturities, amortized cost $ 62,196 $ 60,829  
Fixed maturities, at fair value 63,956 65,393  
Equity securities, cost 686 462  
Equity securities, at fair value 943 645  
Continuous unrealized loss position less than 12 months, fair value 13,836 2,606  
Continuous unrealized loss position less than 12 months, gross unrealized losses 592 27  
Continuous unrealized loss position 12 months or longer, fair value 875 172  
Continuous unrealized loss position 12 months or longer, gross unrealized losses 111 11  
Continuous unrealized loss position, total, fair value 14,711 2,778  
Continuous unrealized loss position, total, gross unrealized losses 703 38  
Available-for-sale securities for which fair value is less than 80% of amortized cost, 3 months or less 7    
Available-for-sale securities for which fair value is less than 80% of amortized cost, greater than 3 months, 6 months or less 3    
Available-for-sale securities for which fair value is less than 80% of amortized cost, greater than 6 months, 12 months or less 1    
Available-for-sale securities for which fair value is less than 80% of amortized cost, greater than 12 months 3    
Available-for-sale securities for which fair value is less than 80% of amortized cost, total 14    
Maxiumum [Member]
      
Investment disclosure details      
Unrealized investment losses for securities for which fair value is less than 80% of amortized cost, as a percentage of the combined fixed maturity and equity security portfolios on a pretax basis 1.00%    
Unrealized investment losses for securities for which fair value is less than 80% of amortized cost, as a percentage of shareholders' equity on an after-tax basis 1.00%    
Fixed maturities [Member]
      
Investment disclosure details      
Fixed maturities, amortized cost 62,196 60,829  
Gross unrealized gains 2,460 4,598  
Gross unrealized losses 700 34  
Fixed maturities, at fair value 63,956 65,393  
Gross realized gains 66 70 63
Gross realized losses 25 9 10
Continuous unrealized loss position less than 12 months, fair value 13,636 2,553  
Continuous unrealized loss position less than 12 months, gross unrealized losses 589 23  
Continuous unrealized loss position 12 months or longer, fair value 875 172  
Continuous unrealized loss position 12 months or longer, gross unrealized losses 111 11  
Continuous unrealized loss position, total, fair value 14,511 2,725  
Continuous unrealized loss position, total, gross unrealized losses 700 34  
Available-for-sale securities for which fair value is less than 80% of amortized cost, 3 months or less 7    
Available-for-sale securities for which fair value is less than 80% of amortized cost, greater than 3 months, 6 months or less 3    
Available-for-sale securities for which fair value is less than 80% of amortized cost, greater than 6 months, 12 months or less 1    
Available-for-sale securities for which fair value is less than 80% of amortized cost, greater than 12 months 3    
Available-for-sale securities for which fair value is less than 80% of amortized cost, total 14    
Fixed maturities [Member] | Below investment grade [Member]
      
Investment disclosure details      
Fixed maturities, at fair value 1,930 2,050  
U.S. Treasury securities and obligations of U.S. government and government agencies and authorities [Member]
      
Investment disclosure details      
Fixed maturities, amortized cost 2,288 2,148  
Gross unrealized gains 39 75  
Gross unrealized losses 12 1  
Fixed maturities, at fair value 2,315 2,222  
Continuous unrealized loss position less than 12 months, fair value 433 589  
Continuous unrealized loss position less than 12 months, gross unrealized losses 12 1  
Continuous unrealized loss position, total, fair value 433 589  
Continuous unrealized loss position, total, gross unrealized losses 12 1  
Obligations of states, municipalities and political subdivisions [Member]
      
Investment disclosure details      
Fixed maturities, amortized cost 34,488 35,863  
Gross unrealized gains 1,436 2,829  
Gross unrealized losses 362 11  
Fixed maturities, at fair value 35,562 38,681  
Continuous unrealized loss position less than 12 months, fair value 4,785 611  
Continuous unrealized loss position less than 12 months, gross unrealized losses 298 9  
Continuous unrealized loss position 12 months or longer, fair value 432 45  
Continuous unrealized loss position 12 months or longer, gross unrealized losses 64 2  
Continuous unrealized loss position, total, fair value 5,217 656  
Continuous unrealized loss position, total, gross unrealized losses 362 11  
Obligations of states, municipalities and political subdivisions, pre-refunded [Member]
      
Investment disclosure details      
Fixed maturities, amortized cost 9,074 8,458  
Gross unrealized gains 445 567  
Gross unrealized losses 1    
Fixed maturities, at fair value 9,518 9,025  
Obligations of states, municipalities and political subdivisions, all other (not pre-refunded) [Member]
      
Investment disclosure details      
Fixed maturities, amortized cost 25,414 27,405  
Gross unrealized gains 991 2,262  
Gross unrealized losses 361 11  
Fixed maturities, at fair value 26,044 29,656  
Debt securities issued by foreign governments [Member]
      
Investment disclosure details      
Fixed maturities, amortized cost 2,552 2,185  
Gross unrealized gains 33 72  
Gross unrealized losses 8    
Fixed maturities, at fair value 2,577 2,257  
Continuous unrealized loss position less than 12 months, fair value 907 186  
Continuous unrealized loss position less than 12 months, gross unrealized losses 8    
Continuous unrealized loss position 12 months or longer, fair value 1 2  
Continuous unrealized loss position, total, fair value 908 188  
Continuous unrealized loss position, total, gross unrealized losses 8    
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities [Member]
      
Investment disclosure details      
Fixed maturities, amortized cost 2,263 2,744  
Gross unrealized gains 179 255  
Gross unrealized losses 18 2  
Fixed maturities, at fair value 2,424 2,997  
Continuous unrealized loss position less than 12 months, fair value 542 70  
Continuous unrealized loss position less than 12 months, gross unrealized losses 17    
Continuous unrealized loss position 12 months or longer, fair value 21 36  
Continuous unrealized loss position 12 months or longer, gross unrealized losses 1 2  
Continuous unrealized loss position, total, fair value 563 106  
Continuous unrealized loss position, total, gross unrealized losses 18 2  
Residential mortgage-backed pass-through securities classified as available-for-sale, GNMA, FNMA, FHLMC [Member]
      
Investment disclosure details      
Fixed maturities, at fair value 1,060 1,440  
Residential collateralized mortgage obligations [Member]
      
Investment disclosure details      
Fixed maturities, at fair value 1,360 1,560  
Percent guaranteed by or fully collateralized by securities issued by GNMA, FNMA or FHLMC 42.00% 43.00%  
Non-guaranteed residential collateralized mortgage obligations [Member]
      
Investment disclosure details      
Fixed maturities, at fair value 790 893  
All other corporate bonds [Member]
      
Investment disclosure details      
Fixed maturities, amortized cost 20,472 17,863  
Gross unrealized gains 767 1,360  
Gross unrealized losses 299 20  
Fixed maturities, at fair value 20,940 19,203  
Continuous unrealized loss position less than 12 months, fair value 6,887 1,097  
Continuous unrealized loss position less than 12 months, gross unrealized losses 253 13  
Continuous unrealized loss position 12 months or longer, fair value 421 89  
Continuous unrealized loss position 12 months or longer, gross unrealized losses 46 7  
Continuous unrealized loss position, total, fair value 7,308 1,186  
Continuous unrealized loss position, total, gross unrealized losses 299 20  
Commercial mortgage-backed securities [Member]
      
Investment disclosure details      
Fixed maturities, at fair value 475 453  
Commercial mortgage-backed securities, containing guarantees by the U.S. government or a government-sponsored enterprise [Member]
      
Investment disclosure details      
Fixed maturities, at fair value 59 64  
Commercial mortgage-backed securities, non-guaranteed securities [Member]
      
Investment disclosure details      
Fixed maturities, at fair value 416 389  
Commercial mortgage-backed securities, Canadian non-guaranteed securities [Member]
      
Investment disclosure details      
Fixed maturities, at fair value 7 4  
Other fixed maturities [Member]
      
Investment disclosure details      
Available-for-sale securities for which fair value is less than 80% of amortized cost, 3 months or less 7    
Available-for-sale securities for which fair value is less than 80% of amortized cost, greater than 3 months, 6 months or less 3    
Available-for-sale securities for which fair value is less than 80% of amortized cost, greater than 6 months, 12 months or less 1    
Available-for-sale securities for which fair value is less than 80% of amortized cost, greater than 12 months 3    
Available-for-sale securities for which fair value is less than 80% of amortized cost, total 14    
Redeemable preferred stock [Member]
      
Investment disclosure details      
Fixed maturities, amortized cost 133 26  
Gross unrealized gains 6 7  
Gross unrealized losses 1    
Fixed maturities, at fair value 138 33  
Continuous unrealized loss position less than 12 months, fair value 82    
Continuous unrealized loss position less than 12 months, gross unrealized losses 1    
Continuous unrealized loss position, total, fair value 82    
Continuous unrealized loss position, total, gross unrealized losses 1    
Equity securities [Member]
      
Investment disclosure details      
Equity securities, cost 686 462  
Gross unrealized gains 260 187  
Gross unrealized losses 3 4  
Equity securities, at fair value 943 645  
Gross realized gains 16 8 48
Gross realized losses 1   2
Continuous unrealized loss position less than 12 months, fair value 200 53  
Continuous unrealized loss position less than 12 months, gross unrealized losses 3 4  
Continuous unrealized loss position, total, fair value 200 53  
Continuous unrealized loss position, total, gross unrealized losses 3 4  
Equity securities [Member] | Maxiumum [Member]
      
Investment disclosure details      
Gross realized losses   1  
Equity securities, common stock [Member]
      
Investment disclosure details      
Equity securities, cost 385 366  
Gross unrealized gains 226 148  
Gross unrealized losses 1 4  
Equity securities, at fair value 610 510  
Continuous unrealized loss position less than 12 months, fair value 53 40  
Continuous unrealized loss position less than 12 months, gross unrealized losses 1 4  
Continuous unrealized loss position, total, fair value 53 40  
Continuous unrealized loss position, total, gross unrealized losses 1 4  
Equity securities, non-redeemable preferred stock [Member]
      
Investment disclosure details      
Equity securities, cost 301 96  
Gross unrealized gains 34 39  
Gross unrealized losses 2    
Equity securities, at fair value 333 135  
Continuous unrealized loss position less than 12 months, fair value 147 13  
Continuous unrealized loss position less than 12 months, gross unrealized losses 2    
Continuous unrealized loss position, total, fair value 147 13  
Continuous unrealized loss position, total, gross unrealized losses 2    
Real estate [Member]
      
Investment disclosure details      
Gross realized gains 7 19 0
Gross realized losses $ 0 $ 0 $ 0