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INVESTMENTS - Components of Net Investment Income (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | $ 3,755 | $ 3,590 | $ 3,334
Less investment expenses |  |  |  |  |  |  |  |  | 177 | 148 | 114
Net investment income | $ 886 | $ 936 | $ 878 | $ 878 | $ 874 | $ 870 | $ 862 | $ 837 | 3,578 | 3,442 | 3,220
Fixed maturity securities |  |  |  |  |  |  |  |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | 3,141 | 3,142 | 3,173
Equity securities |  |  |  |  |  |  |  |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | 37 | 38 | 42
Commercial mortgage and other loans |  |  |  |  |  |  |  |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | 468 | 333 | 86
Other investments |  |  |  |  |  |  |  |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | 53 | 36 | 8
Short-term investments and cash equivalents |  |  |  |  |  |  |  |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | $ 56 | $ 41 | $ 25

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- Definition Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 + Details
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- Definition Amount of expenses related to the generation of investment income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 + Details
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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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