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Investments (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
U.S. Government and government agencies [Member] |  |
Available for sale fixed maturities and equity securities |  |
Amortized Cost | $ 316 | $ 310
Fair Value | 321 | 314
Gross Unrealized, Gains | 8 | 7
Gross Unrealized, Losses | (3) | (3)
States, municipalities and political subdivisions [Member] |  |
Available for sale fixed maturities and equity securities |  |
Amortized Cost | 5,579 | 5,360
Fair Value | 5,723 | 5,372
Gross Unrealized, Gains | 214 | 156
Gross Unrealized, Losses | (70) | (144)
Foreign government [Member] |  |
Available for sale fixed maturities and equity securities |  |
Amortized Cost | 184 | 198
Fair Value | 193 | 208
Gross Unrealized, Gains | 9 | 10
Gross Unrealized, Losses | 0 | 0
Residential Mortgage Backed Securities [Member] |  |
Available for sale fixed maturities and equity securities |  |
Amortized Cost | 4,193 | 3,947
Fair Value | 4,581 | 4,310
Gross Unrealized, Gains | 412 | 391
Gross Unrealized, Losses | (24) | (28)
Commercial Mortgage Backed Securities [Member] |  |
Available for sale fixed maturities and equity securities |  |
Amortized Cost | 2,435 | 2,535
Fair Value | 2,619 | 2,724
Gross Unrealized, Gains | 185 | 192
Gross Unrealized, Losses | (1) | (3)
Asset-backed Securities [Member] |  |
Available for sale fixed maturities and equity securities |  |
Amortized Cost | 2,737 | 2,477
Fair Value | 2,760 | 2,493
Gross Unrealized, Gains | 39 | 35
Gross Unrealized, Losses | (16) | (19)
All other corporate [Member] |  |
Available for sale fixed maturities and equity securities |  |
Amortized Cost | 10,540 | 10,539
Fair Value | 11,193 | 11,035
Gross Unrealized, Gains | 702 | 604
Gross Unrealized, Losses | (49) | (108)
Fixed maturities [Member] |  |
Available for sale fixed maturities and equity securities |  |
Amortized Cost | 25,984 | 25,366
Fair Value | 27,390 | 26,456
Gross Unrealized, Gains | 1,569 | 1,395
Gross Unrealized, Losses | (163) | (305)
Common stocks [Member] |  |
Available for sale fixed maturities and equity securities |  |
Amortized Cost | 801 | 721
Fair Value | 996 | 914
Gross Unrealized, Gains | 207 | 209
Gross Unrealized, Losses | (12) | (16)
Perpetual preferred stocks [Member] |  |
Available for sale fixed maturities and equity securities |  |
Amortized Cost | 291 | 266
Fair Value | 301 | 265
Gross Unrealized, Gains | 15 | 9
Gross Unrealized, Losses | $ (5) | $ (10)

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