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Investments - Limited Partnership Investments (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Net Investment Income [Line Items] |  |  |
Investment Company, Financial Support to Investee Contractually Required, Amount | $ 185 |  |
Limited Partnership [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Investments | 573 | $ 496 |
Alternative Investment, Net Gain (Loss) | $ 143 | $ 241 | $ 27

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- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=SL6742756-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 54B -URI http://asc.fasb.org/extlink&oid=122636397&loc=SL7495116-110257 + Details
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- Definition Amount of financial support committed by investment company to investee that is contractually required. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 20 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66023616&loc=SL35737432-115832 + Details
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