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INVESTMENTS - Information Regarding Pretax Net Gains and Losses From Investments (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Gain (Loss) on Securities [Line Items] |  |  |  |
Total net investment gains (losses) | $ (171) | $ 108 | $ 224 | $ (525)
Credit Losses |  |  |  |
Fixed maturity securities available for sale | 27 | 0 | 38 | (75)
Fixed maturity securities held to maturity | 0 | 0 | 1 | 1
Commercial mortgage and other loans | (29) | 78 | 15 | (86)
Impairment losses | 0 | 0 | (20) | 0
Loan commitments | 3 | 64 | 3 | (17)
Reinsurance recoverable and other | 0 | 0 | (2) | (2)
Total credit losses | 1 | 142 | 35 | (179)
Derivatives and Other |  |  |  |
Derivative gains (losses) | (174) | 138 | (557) | 173
Foreign currency gains (losses) | 135 | (186) | 783 | (356)
Derivatives and other |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Total net investment gains (losses) | (39) | (48) | 226 | (183)
Equity securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Total net investment gains (losses) | (119) | 12 | (17) | (106)
Fixed maturity securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross gains from sales | 24 | 7 | 40 | 28
Gross losses from sales | (36) | 0 | (39) | (46)
Foreign currency gains (losses) on sales and redemptions | (2) | (5) | (21) | (39)
Total net investment gains (losses) | $ (14) | $ 2 | $ (20) | $ (57)

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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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