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Investments (Investment Related Gains (Losses) Net) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Debt Securities, Available-for-sale [Abstract] |  |  |
Other than Temporary Impairment Losses, Investments | $ (12) | $ (21) | $ (31)
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments | (65) | (82) | (50)
Gain (Loss) on Sale of Equity Investments | 25 | (15) | 16
Available-for-sale Securities, Gross Realized Gains | 299 | 114 | 151
Other Impairment Losses And Change In Mortgage Loan Provision | 29 | (56) | (12)
Change in fair value of certain limited partnership investments and other, net | 194 | 24 | 13
Derivatives And Other Investments Net | 90 | 3 | 4
Realized Investment Gains (Losses) | $ 560 | $ (33) | $ 91

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- Definition Net realized gains or losses on investments during the period related to the change in value of embedded derivatives and other realized gains and losses not otherwise categorized. + References No definition available. + Details
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- Definition Amount of increase (decrease) in allowance for credit loss of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563 + Details
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- Definition Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563 + Details
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