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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 | Jun. 30, 2017 | Dec. 31, 2016
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Total fixed maturities |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (72) | $ (196)
Fair Value - Less than twelve months | $ 4,607 | $ 8,651
Fair Value as % of Cost - Less than twelve months | 98.00% | 98.00%
Unrealized Loss - Twelve months or more | $ (35) | $ (49)
Fair Value - Twelve months or more | $ 871 | $ 1,160
Fair Value as % of Cost - Twelve months or more | 96.00% | 96.00%
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 | $ 150 | $ 153
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 | $ 8
Fair Value as % of Cost - Twelve months or more | 80.00% | 80.00%
States, municipalities and political subdivisions |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (26) | $ (64)
Fair Value - Less than twelve months | $ 1,345 | $ 2,289
Fair Value as % of Cost - Less than twelve months | 98.00% | 97.00%
Unrealized Loss - Twelve months or more | $ (3) | $ (5)
Fair Value - Twelve months or more | $ 46 | $ 44
Fair Value as % of Cost - Twelve months or more | 94.00% | 90.00%
Residential MBS |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (5) | $ (7)
Fair Value - Less than twelve months | $ 308 | $ 502
Fair Value as % of Cost - Less than twelve months | 98.00% | 99.00%
Unrealized Loss - Twelve months or more | $ (5) | $ (6)
Fair Value - Twelve months or more | $ 173 | $ 162
Fair Value as % of Cost - Twelve months or more | 97.00% | 96.00%
Commercial MBS |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ 0 | $ (2)
Fair Value - Less than twelve months | $ 74 | $ 121
Fair Value as % of Cost - Less than twelve months | 100.00% | 98.00%
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%
Asset-backed securities |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (8) | $ (29)
Fair Value - Less than twelve months | $ 953 | $ 1,737
Fair Value as % of Cost - Less than twelve months | 99.00% | 98.00%
Unrealized Loss - Twelve months or more | $ (10) | $ (17)
Fair Value - Twelve months or more | $ 388 | $ 634
Fair Value as % of Cost - Twelve months or more | 97.00% | 97.00%
Corporate and other |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (33) | $ (93)
Fair Value - Less than twelve months | $ 1,777 | $ 3,849
Fair Value as % of Cost - Less than twelve months | 98.00% | 98.00%
Unrealized Loss - Twelve months or more | $ (15) | $ (19)
Fair Value - Twelve months or more | $ 256 | $ 312
Fair Value as % of Cost - Twelve months or more | 94.00% | 94.00%
Total equity securities |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (27) | $ (29)
Fair Value - Less than twelve months | $ 232 | $ 350
Fair Value as % of Cost - Less than twelve months | 90.00% | 92.00%
Unrealized Loss - Twelve months or more | $ (1) | $ (1)
Fair Value - Twelve months or more | $ 8 | $ 6
Fair Value as % of Cost - Twelve months or more | 89.00% | 86.00%
Common stocks |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (27) | $ (23)
Fair Value - Less than twelve months | $ 204 | $ 215
Fair Value as % of Cost - Less than twelve months | 88.00% | 90.00%
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 | $ 0 | $ (6)
Fair Value - Less than twelve months | $ 28 | $ 135
Fair Value as % of Cost - Less than twelve months | 100.00% | 96.00%
Unrealized Loss - Twelve months or more | $ (1) | $ (1)
Fair Value - Twelve months or more | $ 8 | $ 6
Fair Value as % of Cost - Twelve months or more | 89.00% | 86.00%

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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=82897076&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=82897076&loc=d3e27337-111563 + 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 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&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=82897076&loc=d3e27337-111563 + Details
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