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Investments (Investment Related Gains (Losses) Net) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Investment Gains And Losses [Abstract] |  |  |  |
Gain on investment activity | $ (20) | $ (45) | $ (65) | $ (265)
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments | (106) | (9) | (236) | (52)
Gain (Loss) on Sale of Equity Investments | 7 | 8 | (16) | 31
Other impairment losses and change in mortgage loan provision | (6) | 4 | (9) | 25
Derivatives and other, net | (47) | (16) | (334) | 31
Total investment related gains (losses), net | (134) | 58 | (514) | 472
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net | (9) | (1) | (36) | 2
Change in Fair Value Limited Partnership Investments and Other Net | $ 7 | $ 27 | $ 52 | $ 170

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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 https://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 https://asc.fasb.org/extlink&oid=126970911&loc=d3e27357-111563 + Details
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