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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