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Investments - Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | $ 199 | $ 50
Investment expenses | (9) | 0
Investment Income, Excluding Capital Gains or Losses | 190 | 50
Realized Investment Gains (Losses) | 59 | 0
Net investment income | 249 | 50
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net | (7) | 0
Supporting Experience Rated Products [Member] |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Net investment income | 11 | 0
Debt Securities [Member] |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | 156 | 50
Mortgage Loans [Member] |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | 17 | 0
Other Investments [Member] |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | $ 26 | $ 0

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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(a),(b)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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- Definition Amount of expenses related to the generation of investment income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 2: 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 The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References No definition available. + Details
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- Definition The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + 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 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 + Details
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