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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net Investment Income [Line Items] |  |  |
Investment expenses | $ (71) | $ (59) | $ (59)
Total net investment income | 1,603 | 1,577 | 1,561
Total fixed maturities |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | 1,303 | 1,319 | 1,301
Equity securities |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | 24 | 22 | 17
Mortgage loans |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | 124 | 116 | 115
Limited partnerships and other alternative investments |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | 174 | 128 | 130
Other investments |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | $ 49 | $ 51 | $ 57

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- Definition Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16(Column G)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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