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Investments - Investments - Net Realized Capital Gains (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Schedule of Investments [Line Items] |  |
Gross gains on sales | $ 31 | $ 78
Gross losses on sales | (31) | (8)
Reduction due to intent to sell | 0 | (5)
Total net realized capital gains | 80 | (231)
Equity Securities, FV-NI, Unrealized Gain (Loss) | 40 | (277)
Other, net |  |
Schedule of Investments [Line Items] |  |
Other, net | 29 | 104
Non-qualifying foreign currency derivatives |  |
Schedule of Investments [Line Items] |  |
Non-qualifying foreign currency derivatives | 35 | 92
Non-qualifying foreign currency derivatives | Other Credit Derivatives |  |
Schedule of Investments [Line Items] |  |
Non-qualifying foreign currency derivatives | (7) | 10
Equity Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Equity securities | 43 | (386)
Total Fixed Maturities, AFS |  |
Schedule of Investments [Line Items] |  |
Change in ACL on fixed maturities, AFS | 4 | (12)
Mortgages [Member] |  |
Schedule of Investments [Line Items] |  |
Change in ACL on mortgage loans | $ 4 | $ (2)

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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=121582814&loc=SL82922900-210455 + Details
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- Definition Amount of decrease in allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) from intent to sell or more likely than not will be required to sell before recovery of amortized cost basis. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 + Details
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