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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net Investment Income [Line Items] |  |  |
Investment expenses | $ (77) | $ (71) | $ (59)
Total net investment income | 1,780 | 1,603 | 1,577
Total fixed maturities |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | 1,459 | 1,303 | 1,319
Equity securities |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | 32 | 24 | 22
Mortgage loans |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | 141 | 124 | 116
Limited partnerships and other alternative investments |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | 205 | 174 | 128
Other investments |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | $ 20 | $ 49 | $ 51

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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