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Investments (Details 1) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
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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 | $ (1)
Fair Value - Less than twelve months | $ 12 | $ 112
Fair Value as % of Cost - Less than twelve months | 100.00% | 99.00%
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 | $ (3) | $ (33)
Fair Value - Less than twelve months | $ 213 | $ 1,419
Fair Value as % of Cost - Less than twelve months | 99.00% | 98.00%
Unrealized Loss - Twelve months or more | $ (5) | $ (2)
Fair Value - Twelve months or more | $ 141 | $ 50
Fair Value as % of Cost - Twelve months or more | 97.00% | 96.00%
Residential Mortgage Backed Securities [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (14) | $ (7)
Fair Value - Less than twelve months | $ 748 | $ 438
Fair Value as % of Cost - Less than twelve months | 98.00% | 98.00%
Unrealized Loss - Twelve months or more | $ (12) | $ (8)
Fair Value - Twelve months or more | $ 243 | $ 201
Fair Value as % of Cost - Twelve months or more | 95.00% | 96.00%
Commercial Mortgage Backed Securities [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 | $ 50 | $ 95
Fair Value as % of Cost - Less than twelve months | 100.00% | 100.00%
Unrealized Loss - Twelve months or more | $ (1) | $ (1)
Fair Value - Twelve months or more | $ 15 | $ 28
Fair Value as % of Cost - Twelve months or more | 94.00% | 97.00%
Asset-backed Securities [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (60) | $ (42)
Fair Value - Less than twelve months | $ 2,377 | $ 2,706
Fair Value as % of Cost - Less than twelve months | 98.00% | 98.00%
Unrealized Loss - Twelve months or more | $ (11) | $ (10)
Fair Value - Twelve months or more | $ 449 | $ 455
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 | $ (130) | $ (229)
Fair Value - Less than twelve months | $ 2,026 | $ 4,661
Fair Value as % of Cost - Less than twelve months | 94.00% | 95.00%
Unrealized Loss - Twelve months or more | $ (42) | $ (39)
Fair Value - Twelve months or more | $ 324 | $ 165
Fair Value as % of Cost - Twelve months or more | 89.00% | 81.00%
Fixed maturities [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (207) | $ (312)
Fair Value - Less than twelve months | $ 5,426 | $ 9,431
Fair Value as % of Cost - Less than twelve months | 96.00% | 97.00%
Unrealized Loss - Twelve months or more | $ (73) | $ (62)
Fair Value - Twelve months or more | $ 1,187 | $ 914
Fair Value as % of Cost - Twelve months or more | 94.00% | 94.00%
Common stocks [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (81) | $ (79)
Fair Value - Less than twelve months | $ 498 | $ 509
Fair Value as % of Cost - Less than twelve months | 86.00% | 87.00%
Unrealized Loss - Twelve months or more | $ 0 | $ 0
Fair Value - Twelve months or more | $ 2 | $ 0
Fair Value as % of Cost - Twelve months or more | 100.00% | 0.00%
Perpetual preferred stocks [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (5) | $ (3)
Fair Value - Less than twelve months | $ 117 | $ 91
Fair Value as % of Cost - Less than twelve months | 96.00% | 97.00%
Unrealized Loss - Twelve months or more | $ (4) | $ (3)
Fair Value - Twelve months or more | $ 22 | $ 22
Fair Value as % of Cost - Twelve months or more | 85.00% | 88.00%
Equity securities [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (86) | $ (82)
Fair Value - Less than twelve months | $ 615 | $ 600
Fair Value as % of Cost - Less than twelve months | 88.00% | 88.00%
Unrealized Loss - Twelve months or more | $ (4) | $ (3)
Fair Value - Twelve months or more | $ 24 | $ 22
Fair Value as % of Cost - Twelve months or more | 86.00% | 88.00%

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