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Investments (Details 1) (USD $) In Millions, unless otherwise specified | Sep. 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 | $ 0 | $ (3)
Fair Value - Less than twelve months | 22 | 60
Fair Value as % of Cost - Less than twelve months | 100.00% | 95.00%
Unrealized Loss - Twelve months or more | (2) | 0
Fair Value - Twelve months or more | 15 | 0
Fair Value as % of Cost - Twelve months or more | 88.00% | 0.00%
States, municipalities and political subdivisions [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | (7) | (135)
Fair Value - Less than twelve months | 617 | 2,219
Fair Value as % of Cost - Less than twelve months | 99.00% | 94.00%
Unrealized Loss - Twelve months or more | (20) | (9)
Fair Value - Twelve months or more | 566 | 73
Fair Value as % of Cost - Twelve months or more | 97.00% | 89.00%
Foreign government [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | 0 |
Fair Value - Less than twelve months | 84 |
Fair Value as % of Cost - Less than twelve months | 100.00% |
Unrealized Loss - Twelve months or more | 0 |
Fair Value - Twelve months or more | 0 |
Fair Value as % of Cost - Twelve months or more | 0.00% |
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 | 330 | 553
Fair Value as % of Cost - Less than twelve months | 99.00% | 98.00%
Unrealized Loss - Twelve months or more | (12) | (19)
Fair Value - Twelve months or more | 225 | 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 | 0 | (3)
Fair Value - Less than twelve months | 44 | 106
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 | 11 | 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 | (10) | (18)
Fair Value - Less than twelve months | 1,490 | 1,310
Fair Value as % of Cost - Less than twelve months | 99.00% | 99.00%
Unrealized Loss - Twelve months or more | (9) | (1)
Fair Value - Twelve months or more | 485 | 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 | (13) | (101)
Fair Value - Less than twelve months | 1,277 | 2,634
Fair Value as % of Cost - Less than twelve months | 99.00% | 96.00%
Unrealized Loss - Twelve months or more | (18) | (7)
Fair Value - Twelve months or more | 580 | 85
Fair Value as % of Cost - Twelve months or more | 97.00% | 92.00%
Fixed maturities [Member] |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | (34) | (269)
Fair Value - Less than twelve months | 3,864 | 6,882
Fair Value as % of Cost - Less than twelve months | 99.00% | 96.00%
Unrealized Loss - Twelve months or more | (61) | (36)
Fair Value - Twelve months or more | 1,882 | 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 | (36) | (16)
Fair Value - Less than twelve months | 278 | 158
Fair Value as % of Cost - Less than twelve months | 89.00% | 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 | 61 | 91
Fair Value as % of Cost - Less than twelve months | 98.00% | 94.00%
Unrealized Loss - Twelve months or more | (3) | (4)
Fair Value - Twelve months or more | $ 57 | $ 20
Fair Value as % of Cost - Twelve months or more | 95.00% | 83.00%

X
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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