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Investments (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | $ 32,749 | $ 31,565
Available for sale (AFS) fixed maturities | 33,921 | 32,284
Equity securities, Available for sale, Amortized Cost | 1,475 | 1,469
Equity securities, Available for sale, Fair Value | 1,536 | 1,553
U.S. Government and government agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 333 | 305
Fixed maturities, Available for sale, Gross Unrealized, Gains | 7 | 5
Fixed maturities, Available for sale, Gross Unrealized, Losses | (2) | (3)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 5 | 2
Available for sale (AFS) fixed maturities | 338 | 307
States, municipalities and political subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 6,691 | 6,642
Fixed maturities, Available for sale, Gross Unrealized, Gains | 369 | 249
Fixed maturities, Available for sale, Gross Unrealized, Losses | (8) | (35)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 361 | 214
Available for sale (AFS) fixed maturities | 7,052 | 6,856
Foreign government [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 139 | 147
Fixed maturities, Available for sale, Gross Unrealized, Gains | 8 | 7
Fixed maturities, Available for sale, Gross Unrealized, Losses | 0 | 0
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 8 | 7
Available for sale (AFS) fixed maturities | 147 | 154
Residential Mortgage Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 3,508 | 3,236
Fixed maturities, Available for sale, Gross Unrealized, Gains | 290 | 308
Fixed maturities, Available for sale, Gross Unrealized, Losses | (26) | (15)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 264 | 293
Available for sale (AFS) fixed maturities | 3,772 | 3,529
Commercial Mortgage Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 2,046 | 2,111
Fixed maturities, Available for sale, Gross Unrealized, Gains | 91 | 77
Fixed maturities, Available for sale, Gross Unrealized, Losses | (1) | (1)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 90 | 76
Available for sale (AFS) fixed maturities | 2,136 | 2,187
Asset-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 5,172 | 4,961
Fixed maturities, Available for sale, Gross Unrealized, Gains | 29 | 25
Fixed maturities, Available for sale, Gross Unrealized, Losses | (71) | (52)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | (42) | (27)
Available for sale (AFS) fixed maturities | 5,130 | 4,934
All other corporate [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 14,860 | 14,163
Fixed maturities, Available for sale, Gross Unrealized, Gains | 658 | 422
Fixed maturities, Available for sale, Gross Unrealized, Losses | (172) | (268)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 486 | 154
Available for sale (AFS) fixed maturities | 15,346 | 14,317
Fixed maturities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 32,749 | 31,565
Fixed maturities, Available for sale, Gross Unrealized, Gains | 1,452 | 1,093
Fixed maturities, Available for sale, Gross Unrealized, Losses | (280) | (374)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 1,172 | 719
Available for sale (AFS) fixed maturities | 33,921 | 32,284
Common stocks [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity securities, Available for sale, Amortized Cost | 1,041 | 1,051
Equity securities, Available for sale, Gross Unrealized, Gains | 129 | 146
Equity securities, Available for sale, Gross Unrealized, Losses | (81) | (79)
Equity securities, Available for sale, Net Unrealized, Gains (Losses) | 48 | 67
Equity securities, Available for sale, Fair Value | 1,089 | 1,118
Perpetual preferred stocks [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity securities, Available for sale, Amortized Cost | 434 | 418
Equity securities, Available for sale, Gross Unrealized, Gains | 22 | 23
Equity securities, Available for sale, Gross Unrealized, Losses | (9) | (6)
Equity securities, Available for sale, Net Unrealized, Gains (Losses) | 13 | 17
Equity securities, Available for sale, Fair Value | 447 | 435
Equity securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity securities, Available for sale, Amortized Cost | 1,475 | 1,469
Equity securities, Available for sale, Gross Unrealized, Gains | 151 | 169
Equity securities, Available for sale, Gross Unrealized, Losses | (90) | (85)
Equity securities, Available for sale, Net Unrealized, Gains (Losses) | 61 | 84
Equity securities, Available for sale, Fair Value | $ 1,536 | $ 1,553

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