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Investments - Gross unrealized losses on securities by investment category and length of time that have been in a continuous unrealized loss position (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
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Total fixed maturities |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (30) | $ (312)
Fair Value - Less than twelve months | $ 2,149 | $ 9,431
Fair Value as % of Cost - Less than twelve months | 99.00% | 97.00%
Unrealized Loss - Twelve months or more | $ (47) | $ (62)
Fair Value - Twelve months or more | $ 1,091 | $ 914
Fair Value as % of Cost - Twelve months or more | 96.00% | 94.00%
U.S. Government and government agencies |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ 0 | $ (1)
Fair Value - Less than twelve months | $ 51 | $ 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 | $ 8 | $ 15
Fair Value as % of Cost - Twelve months or more | 80.00% | 88.00%
States, municipalities and political subdivisions |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (2) | $ (33)
Fair Value - Less than twelve months | $ 191 | $ 1,419
Fair Value as % of Cost - Less than twelve months | 99.00% | 98.00%
Unrealized Loss - Twelve months or more | $ (3) | $ (2)
Fair Value - Twelve months or more | $ 50 | $ 50
Fair Value as % of Cost - Twelve months or more | 94.00% | 96.00%
Residential MBS |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (7) | $ (7)
Fair Value - Less than twelve months | $ 490 | $ 438
Fair Value as % of Cost - Less than twelve months | 99.00% | 98.00%
Unrealized Loss - Twelve months or more | $ (7) | $ (8)
Fair Value - Twelve months or more | $ 158 | $ 201
Fair Value as % of Cost - Twelve months or more | 96.00% | 96.00%
Commercial MBS |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ 0 | $ 0
Fair Value - Less than twelve months | $ 23 | $ 95
Fair Value as % of Cost - Less than twelve months | 100.00% | 100.00%
Unrealized Loss - Twelve months or more | $ 0 | $ (1)
Fair Value - Twelve months or more | $ 4 | $ 28
Fair Value as % of Cost - Twelve months or more | 100.00% | 97.00%
Asset-backed securities |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (13) | $ (42)
Fair Value - Less than twelve months | $ 924 | $ 2,706
Fair Value as % of Cost - Less than twelve months | 99.00% | 98.00%
Unrealized Loss - Twelve months or more | $ (12) | $ (10)
Fair Value - Twelve months or more | $ 535 | $ 455
Fair Value as % of Cost - Twelve months or more | 98.00% | 98.00%
Corporate and other |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (8) | $ (229)
Fair Value - Less than twelve months | $ 470 | $ 4,661
Fair Value as % of Cost - Less than twelve months | 98.00% | 95.00%
Unrealized Loss - Twelve months or more | $ (23) | $ (39)
Fair Value - Twelve months or more | $ 336 | $ 165
Fair Value as % of Cost - Twelve months or more | 94.00% | 81.00%
Total equity securities |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (29) | $ (82)
Fair Value - Less than twelve months | $ 322 | $ 600
Fair Value as % of Cost - Less than twelve months | 92.00% | 88.00%
Unrealized Loss - Twelve months or more | $ (1) | $ (3)
Fair Value - Twelve months or more | $ 6 | $ 22
Fair Value as % of Cost - Twelve months or more | 86.00% | 88.00%
Common stocks |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (27) | $ (79)
Fair Value - Less than twelve months | $ 233 | $ 509
Fair Value as % of Cost - Less than twelve months | 90.00% | 87.00%
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 |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (2) | $ (3)
Fair Value - Less than twelve months | $ 89 | $ 91
Fair Value as % of Cost - Less than twelve months | 98.00% | 97.00%
Unrealized Loss - Twelve months or more | $ (1) | $ (3)
Fair Value - Twelve months or more | $ 6 | $ 22
Fair Value as % of Cost - Twelve months or more | 86.00% | 88.00%

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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 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 2: 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=73527792&loc=d3e27337-111563 + Details
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