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Investments -Interest and Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | $ 556 | $ 163 | $ 997 | $ 216
Investment expense | (42) | (11) | (81) | (11)
Interest and investment income | 514 | 152 | 916 | 205
Fixed maturity securities, available-for-sale |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | 325 | 117 | 631 | 134
Equity securities |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | 5 | 13 | 10 | 17
Preferred securities |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | 18 | 11 | 32 | 17
Mortgage loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | 33 | 7 | 56 | 7
Invested cash and short-term investments |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | 1 | 8 | 1 | 33
Limited partnerships |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | 164 | 0 | 244 | 0
Tax deferred property exchange income |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | 4 | 0 | 9 | 0
Other investments |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | $ 6 | $ 7 | $ 14 | $ 8

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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=120400993&loc=SL114874131-224263 + 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=123367319&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=120400993&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=120400993&loc=SL114874131-224263 + Details
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