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Investments (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | $ 31,868 | $ 29,074
Available for sale (AFS) fixed maturities | 33,114 | 30,734
Equity securities, Available for sale, Amortized Cost | 1,590 | 1,283
Equity securities, Available for sale, Fair Value | 1,658 | 1,501
U.S. Government and government agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 329 | 347
Available for sale (AFS) fixed maturities | 335 | 353
Fixed maturities, Available for sale, Gross Unrealized, Gains | 8 | 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 | 6,874 | 6,393
Available for sale (AFS) fixed maturities | 7,166 | 6,747
Fixed maturities, Available for sale, Gross Unrealized, Gains | 321 | 364
Fixed maturities, Available for sale, Gross Unrealized, Losses | (29) | (10)
Foreign government [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 157 | 184
Available for sale (AFS) fixed maturities | 166 | 194
Fixed maturities, Available for sale, Gross Unrealized, Gains | 9 | 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 | 3,540 | 4,046
Available for sale (AFS) fixed maturities | 3,879 | 4,442
Fixed maturities, Available for sale, Gross Unrealized, Gains | 354 | 411
Fixed maturities, Available for sale, Gross Unrealized, Losses | (15) | (15)
Commercial Mortgage Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 2,185 | 2,294
Available for sale (AFS) fixed maturities | 2,297 | 2,451
Fixed maturities, Available for sale, Gross Unrealized, Gains | 112 | 158
Fixed maturities, Available for sale, Gross Unrealized, Losses | 0 | (1)
Asset-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 4,673 | 3,872
Available for sale (AFS) fixed maturities | 4,701 | 3,887
Fixed maturities, Available for sale, Gross Unrealized, Gains | 47 | 37
Fixed maturities, Available for sale, Gross Unrealized, Losses | (19) | (22)
All other corporate [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 14,110 | 11,938
Available for sale (AFS) fixed maturities | 14,570 | 12,660
Fixed maturities, Available for sale, Gross Unrealized, Gains | 606 | 751
Fixed maturities, Available for sale, Gross Unrealized, Losses | (146) | (29)
Fixed maturities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 31,868 | 29,074
Available for sale (AFS) fixed maturities | 33,114 | 30,734
Fixed maturities, Available for sale, Gross Unrealized, Gains | 1,457 | 1,739
Fixed maturities, Available for sale, Gross Unrealized, Losses | (211) | (79)
Common stocks [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity securities, Available for sale, Amortized Cost | 1,147 | 885
Equity securities, Available for sale, Fair Value | 1,204 | 1,087
Equity securities, Available for sale, Gross Unrealized, Gains | 151 | 227
Equity securities, Available for sale, Gross Unrealized, Losses | (94) | (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 | 454 | 414
Equity securities, Available for sale, Gross Unrealized, Gains | 18 | 21
Equity securities, Available for sale, Gross Unrealized, Losses | $ (7) | $ (5)

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