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Investments (Details 1) - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014
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U.S. Government and government agencies [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ 0 | $ 0
Fair Value - Less than twelve months | $ 2 | $ 39
Fair Value as % of Cost - Less than twelve months | 100.00% | 100.00%
Unrealized Loss - Twelve months or more | $ (2) | $ (2)
Fair Value - Twelve months or more | $ 15 | $ 15
Fair Value as % of Cost - Twelve months or more | 88.00% | 88.00%
States, municipalities and political subdivisions [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (27) | $ (2)
Fair Value - Less than twelve months | $ 1,197 | $ 222
Fair Value as % of Cost - Less than twelve months | 98.00% | 99.00%
Unrealized Loss - Twelve months or more | $ (2) | $ (8)
Fair Value - Twelve months or more | $ 58 | $ 408
Fair Value as % of Cost - Twelve months or more | 97.00% | 98.00%
Residential Mortgage Backed Securities [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (6) | $ (4)
Fair Value - Less than twelve months | $ 347 | $ 298
Fair Value as % of Cost - Less than twelve months | 98.00% | 99.00%
Unrealized Loss - Twelve months or more | $ (9) | $ (11)
Fair Value - Twelve months or more | $ 223 | $ 209
Fair Value as % of Cost - Twelve months or more | 96.00% | 95.00%
Commercial Mortgage Backed Securities [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ 0 | $ (1)
Fair Value - Less than twelve months | $ 23 | $ 38
Fair Value as % of Cost - Less than twelve months | 100.00% | 97.00%
Unrealized Loss - Twelve months or more | $ 0 | $ 0
Fair Value - Twelve months or more | $ 31 | $ 11
Fair Value as % of Cost - Twelve months or more | 100.00% | 100.00%
Asset-backed Securities [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (12) | $ (11)
Fair Value - Less than twelve months | $ 1,315 | $ 1,389
Fair Value as % of Cost - Less than twelve months | 99.00% | 99.00%
Unrealized Loss - Twelve months or more | $ (7) | $ (11)
Fair Value - Twelve months or more | $ 414 | $ 622
Fair Value as % of Cost - Twelve months or more | 98.00% | 98.00%
All other corporate [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (124) | $ (16)
Fair Value - Less than twelve months | $ 3,197 | $ 588
Fair Value as % of Cost - Less than twelve months | 96.00% | 97.00%
Unrealized Loss - Twelve months or more | $ (22) | $ (13)
Fair Value - Twelve months or more | $ 132 | $ 433
Fair Value as % of Cost - Twelve months or more | 86.00% | 97.00%
Fixed maturities [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (169) | $ (34)
Fair Value - Less than twelve months | $ 6,081 | $ 2,574
Fair Value as % of Cost - Less than twelve months | 97.00% | 99.00%
Unrealized Loss - Twelve months or more | $ (42) | $ (45)
Fair Value - Twelve months or more | $ 873 | $ 1,698
Fair Value as % of Cost - Twelve months or more | 95.00% | 97.00%
Common stocks [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (94) | $ (25)
Fair Value - Less than twelve months | $ 590 | $ 260
Fair Value as % of Cost - Less than twelve months | 86.00% | 91.00%
Unrealized Loss - Twelve months or more | $ 0 | $ 0
Fair Value - Twelve months or more | $ 0 | $ 0
Fair Value as % of Cost - Twelve months or more | 0.00% | 0.00%
Perpetual preferred stocks [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (4) | $ (1)
Fair Value - Less than twelve months | $ 127 | $ 45
Fair Value as % of Cost - Less than twelve months | 97.00% | 98.00%
Unrealized Loss - Twelve months or more | $ (3) | $ (4)
Fair Value - Twelve months or more | $ 26 | $ 55
Fair Value as % of Cost - Twelve months or more | 90.00% | 93.00%

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