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Investments (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
U.S. Government and government agencies [Member] |  |
Available for sale fixed maturities and equity securities |  |
Amortized Cost | $ 343 | $ 310
Fair Value | 349 | 314
Gross Unrealized, Gains | 8 | 7
Gross Unrealized, Losses | (2) | (3)
States, municipalities and political subdivisions [Member] |  |
Available for sale fixed maturities and equity securities |  |
Amortized Cost | 5,979 | 5,360
Fair Value | 6,228 | 5,372
Gross Unrealized, Gains | 281 | 156
Gross Unrealized, Losses | (32) | (144)
Foreign government [Member] |  |
Available for sale fixed maturities and equity securities |  |
Amortized Cost | 128 | 198
Fair Value | 138 | 208
Gross Unrealized, Gains | 10 | 10
Gross Unrealized, Losses | 0 | 0
Residential Mortgage Backed Securities [Member] |  |
Available for sale fixed maturities and equity securities |  |
Amortized Cost | 4,274 | 3,947
Fair Value | 4,684 | 4,310
Gross Unrealized, Gains | 428 | 391
Gross Unrealized, Losses | (18) | (28)
Commercial Mortgage Backed Securities [Member] |  |
Available for sale fixed maturities and equity securities |  |
Amortized Cost | 2,390 | 2,535
Fair Value | 2,583 | 2,724
Gross Unrealized, Gains | 194 | 192
Gross Unrealized, Losses | (1) | (3)
Asset-backed Securities [Member] |  |
Available for sale fixed maturities and equity securities |  |
Amortized Cost | 3,185 | 2,477
Fair Value | 3,219 | 2,493
Gross Unrealized, Gains | 45 | 35
Gross Unrealized, Losses | (11) | (19)
All other corporate [Member] |  |
Available for sale fixed maturities and equity securities |  |
Amortized Cost | 10,988 | 10,539
Fair Value | 11,787 | 11,035
Gross Unrealized, Gains | 820 | 604
Gross Unrealized, Losses | (21) | (108)
Fixed maturities [Member] |  |
Available for sale fixed maturities and equity securities |  |
Amortized Cost | 27,287 | 25,366
Fair Value | 28,988 | 26,456
Gross Unrealized, Gains | 1,786 | 1,395
Gross Unrealized, Losses | (85) | (305)
Common stocks [Member] |  |
Available for sale fixed maturities and equity securities |  |
Amortized Cost | 897 | 721
Fair Value | 1,115 | 914
Gross Unrealized, Gains | 233 | 209
Gross Unrealized, Losses | (15) | (16)
Perpetual preferred stocks [Member] |  |
Available for sale fixed maturities and equity securities |  |
Amortized Cost | 341 | 266
Fair Value | 358 | 265
Gross Unrealized, Gains | 21 | 9
Gross Unrealized, Losses | $ (4) | $ (10)

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