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Investments (Details 1) (USD $) In Millions, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
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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 | $ (2) | $ (3)
Fair Value - Less than twelve months | 18 | 60
Fair Value as % of Cost - Less than twelve months | 90.00% | 95.00%
Unrealized Loss - Twelve months or more | 0 | 0
Fair Value - Twelve months or more | 1 | 0
Fair Value as % of Cost - Twelve months or more | 100.00% | 0.00%
States, municipalities and political subdivisions [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | (3) | (135)
Fair Value - Less than twelve months | 289 | 2,219
Fair Value as % of Cost - Less than twelve months | 99.00% | 94.00%
Unrealized Loss - Twelve months or more | (29) | (9)
Fair Value - Twelve months or more | 933 | 73
Fair Value as % of Cost - Twelve months or more | 97.00% | 89.00%
Residential Mortgage Backed Securities [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | (4) | (9)
Fair Value - Less than twelve months | 304 | 553
Fair Value as % of Cost - Less than twelve months | 99.00% | 98.00%
Unrealized Loss - Twelve months or more | (14) | (19)
Fair Value - Twelve months or more | 260 | 212
Fair Value as % of Cost - Twelve months or more | 95.00% | 92.00%
Commercial Mortgage Backed Securities [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | (1) | (3)
Fair Value - Less than twelve months | 24 | 106
Fair Value as % of Cost - Less than twelve months | 96.00% | 97.00%
Unrealized Loss - Twelve months or more | 0 | 0
Fair Value - Twelve months or more | 17 | 2
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 | (5) | (18)
Fair Value - Less than twelve months | 990 | 1,310
Fair Value as % of Cost - Less than twelve months | 99.00% | 99.00%
Unrealized Loss - Twelve months or more | (6) | (1)
Fair Value - Twelve months or more | 332 | 28
Fair Value as % of Cost - Twelve months or more | 98.00% | 97.00%
All other corporate [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | (4) | (101)
Fair Value - Less than twelve months | 238 | 2,634
Fair Value as % of Cost - Less than twelve months | 98.00% | 96.00%
Unrealized Loss - Twelve months or more | (17) | (7)
Fair Value - Twelve months or more | 772 | 85
Fair Value as % of Cost - Twelve months or more | 98.00% | 92.00%
Fixed maturities [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | (19) | (269)
Fair Value - Less than twelve months | 1,863 | 6,882
Fair Value as % of Cost - Less than twelve months | 99.00% | 96.00%
Unrealized Loss - Twelve months or more | (66) | (36)
Fair Value - Twelve months or more | 2,315 | 400
Fair Value as % of Cost - Twelve months or more | 97.00% | 92.00%
Common stocks [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | (15) | (16)
Fair Value - Less than twelve months | 98 | 158
Fair Value as % of Cost - Less than twelve months | 87.00% | 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 | (1) | (6)
Fair Value - Less than twelve months | 16 | 91
Fair Value as % of Cost - Less than twelve months | 94.00% | 94.00%
Unrealized Loss - Twelve months or more | (3) | (4)
Fair Value - Twelve months or more | $ 52 | $ 20
Fair Value as % of Cost - Twelve months or more | 95.00% | 83.00%

X
- Definition Amount of accumulated pre-tax unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months impacting investments. + References No definition available. + Details
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