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Investments (Details) - USD ($) $ in Millions | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | $ 31,005 | $ 29,074
Available for sale (AFS) fixed maturities | 32,260 | 30,734
Equity securities, Available for sale, Amortized Cost | 1,332 | 1,283
Equity securities, Available for sale, Fair Value | 1,535 | 1,501
U.S. Government and government agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 356 | 347
Available for sale (AFS) fixed maturities | 361 | 353
Fixed maturities, Available for sale, Gross Unrealized, Gains | 7 | 8
Fixed maturities, Available for sale, Gross Unrealized, Losses | (2) | (2)
States, municipalities and political subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 6,869 | 6,393
Available for sale (AFS) fixed maturities | 7,080 | 6,747
Fixed maturities, Available for sale, Gross Unrealized, Gains | 265 | 364
Fixed maturities, Available for sale, Gross Unrealized, Losses | (54) | (10)
Foreign government [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 167 | 184
Available for sale (AFS) fixed maturities | 177 | 194
Fixed maturities, Available for sale, Gross Unrealized, Gains | 10 | 10
Fixed maturities, Available for sale, Gross Unrealized, Losses | 0 | 0
Residential Mortgage Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 3,756 | 4,046
Available for sale (AFS) fixed maturities | 4,114 | 4,442
Fixed maturities, Available for sale, Gross Unrealized, Gains | 371 | 411
Fixed maturities, Available for sale, Gross Unrealized, Losses | (13) | (15)
Commercial Mortgage Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 2,204 | 2,294
Available for sale (AFS) fixed maturities | 2,323 | 2,451
Fixed maturities, Available for sale, Gross Unrealized, Gains | 120 | 158
Fixed maturities, Available for sale, Gross Unrealized, Losses | (1) | (1)
Asset-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 4,355 | 3,872
Available for sale (AFS) fixed maturities | 4,383 | 3,887
Fixed maturities, Available for sale, Gross Unrealized, Gains | 42 | 37
Fixed maturities, Available for sale, Gross Unrealized, Losses | (14) | (22)
All other corporate [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 13,298 | 11,938
Available for sale (AFS) fixed maturities | 13,822 | 12,660
Fixed maturities, Available for sale, Gross Unrealized, Gains | 609 | 751
Fixed maturities, Available for sale, Gross Unrealized, Losses | (85) | (29)
Fixed maturities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 31,005 | 29,074
Available for sale (AFS) fixed maturities | 32,260 | 30,734
Fixed maturities, Available for sale, Gross Unrealized, Gains | 1,424 | 1,739
Fixed maturities, Available for sale, Gross Unrealized, Losses | (169) | (79)
Common stocks [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity securities, Available for sale, Amortized Cost | 889 | 885
Equity securities, Available for sale, Fair Value | 1,076 | 1,087
Equity securities, Available for sale, Gross Unrealized, Gains | 217 | 227
Equity securities, Available for sale, Gross Unrealized, Losses | (30) | (25)
Perpetual preferred stocks [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity securities, Available for sale, Amortized Cost | 443 | 398
Equity securities, Available for sale, Fair Value | 459 | 414
Equity securities, Available for sale, Gross Unrealized, Gains | 21 | 21
Equity securities, Available for sale, Gross Unrealized, Losses | $ (5) | $ (5)

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