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Investments (Details 1) (USD $) In Millions, unless otherwise specified | Mar. 31, 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 | $ (3) | $ (3)
Fair Value - Less than twelve months | 38 | 60
Fair Value as % of Cost - Less than twelve months | 93.00% | 95.00%
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%
States, municipalities and political subdivisions [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | (64) | (135)
Fair Value - Less than twelve months | 1,523 | 2,219
Fair Value as % of Cost - Less than twelve months | 96.00% | 94.00%
Unrealized Loss - Twelve months or more | (6) | (9)
Fair Value - Twelve months or more | 90 | 73
Fair Value as % of Cost - Twelve months or more | 94.00% | 89.00%
Residential Mortgage Backed Securities [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | (8) | (9)
Fair Value - Less than twelve months | 494 | 553
Fair Value as % of Cost - Less than twelve months | 98.00% | 98.00%
Unrealized Loss - Twelve months or more | (16) | (19)
Fair Value - Twelve months or more | 214 | 212
Fair Value as % of Cost - Twelve months or more | 93.00% | 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 | 48 | 106
Fair Value as % of Cost - Less than twelve months | 98.00% | 97.00%
Unrealized Loss - Twelve months or more | 0 | 0
Fair Value - Twelve months or more | 2 | 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 | (14) | (18)
Fair Value - Less than twelve months | 1,101 | 1,310
Fair Value as % of Cost - Less than twelve months | 99.00% | 99.00%
Unrealized Loss - Twelve months or more | (2) | (1)
Fair Value - Twelve months or more | 44 | 28
Fair Value as % of Cost - Twelve months or more | 96.00% | 97.00%
All other corporate [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | (44) | (101)
Fair Value - Less than twelve months | 1,506 | 2,634
Fair Value as % of Cost - Less than twelve months | 97.00% | 96.00%
Unrealized Loss - Twelve months or more | (5) | (7)
Fair Value - Twelve months or more | 86 | 85
Fair Value as % of Cost - Twelve months or more | 95.00% | 92.00%
Fixed maturities [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | (134) | (269)
Fair Value - Less than twelve months | 4,710 | 6,882
Fair Value as % of Cost - Less than twelve months | 97.00% | 96.00%
Unrealized Loss - Twelve months or more | (29) | (36)
Fair Value - Twelve months or more | 436 | 400
Fair Value as % of Cost - Twelve months or more | 94.00% | 92.00%
Common stocks [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | (12) | (16)
Fair Value - Less than twelve months | 166 | 158
Fair Value as % of Cost - Less than twelve months | 93.00% | 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) | (6)
Fair Value - Less than twelve months | 90 | 91
Fair Value as % of Cost - Less than twelve months | 96.00% | 94.00%
Unrealized Loss - Twelve months or more | (1) | (4)
Fair Value - Twelve months or more | $ 6 | $ 20
Fair Value as % of Cost - Twelve months or more | 86.00% | 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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