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Investments, Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Net Investment Income [Abstract] |  |  |  |  |
Investment income |  | $ 634 | $ 662 | $ 1,204 | $ 846
Investment expenses |  | (18) | (18) | (38) | (39)
Net investment income |  | 616 | 644 | 1,166 | 807
Net unrealized gains (losses) on securities |  | 28 | 80 | 58 | 7
Fixed Maturity Securities [Member] |  |  |  |  |
Net Investment Income [Abstract] |  |  |  |  |
Investment income |  | 425 | 430 | 853 | 868
Limited Partnership Investments [Member] |  |  |  |  |
Net Investment Income [Abstract] |  |  |  |  |
Investment income |  | 149 | 57 | 196 | (45)
Short Term Investments [Member] |  |  |  |  |
Net Investment Income [Abstract] |  |  |  |  |
Investment income |  |  | 2 |  | 9
Equity Securities [Member] |  |  |  |  |
Net Investment Income [Abstract] |  |  |  |  |
Investment income |  |  |  | 49 | 6
Investment income |  | 20 | 50 |  |
Income (Loss) from Trading Portfolio [Member] |  |  |  |  |
Net Investment Income [Abstract] |  |  |  |  |
Investment income | [1] | 26 | 107 | 76 | (22)
Other [Member] |  |  |  |  |
Net Investment Income [Abstract] |  |  |  |  |
Investment income |  | $ 14 | $ 16 | $ 30 | $ 30
[1] | Net unrealized gains (losses) related to changes in fair value on securities still held were $28 and $80 for the three months ended June 30, 2021 and 2020 and $58 and $7 for the six months ended June 30, 2021 and 2020.

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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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