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INVESTMENTS - Information Regarding Pretax Realized Gains and Losses From Investments (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Gain (Loss) on Securities [Line Items] |  |  |  |
Loan loss reserves | $ (18) | $ (19) | $ (8) |
Derivative gains (losses) | (174) | (224) | (109) |
Foreign currency gains (losses) | (62) | (10) | (33) |
Total realized investment gains (losses) | (135) | (430) | (151) |
Loan receivables |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Total realized investment gains (losses) | (18) | (19) | (8) |
Derivatives and other |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Total realized investment gains (losses) | (236) | (234) | (142) |
Equity securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Total realized investment gains (losses) | 101 | (131) | 71 | [1]
Other-than-temporary impairment losses realized |  |  | (22) |
Available-for-sale securities | Fixed maturity securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross gains from sales | 115 | 101 | 51 |
Gross losses from sales | (68) | (156) | (68) |
Foreign currency gains (losses) on sales and redemptions | (16) | 73 | (48) |
Other-than-temporary impairment losses realized | (13) | (64) | (7) |
Total realized investment gains (losses) | $ 18 | $ (46) | $ (72) |
[1] | Includes impairments of $22 in 2017

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- Definition Amount of increase (decrease) of allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + 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=118939692&loc=d3e27357-111563 + Details
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