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INVESTMENTS - Allowance for Loan Losses by Portfolio Segment (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Allowance for Loan Losses by Portfolio Segment [Roll Forward] |  |  |  |
Balance, beginning of period | $ (192) |  |  |
(Addition to) release of allowance for credit losses | 146 |  | $ 18 | $ (6)
Balance, end of period | (274) |  | (192) |
Balance, beginning of period | (7) |  |  |
(Addition to) release of allowance for credit losses | (1) |  | 0 | (1)
Balance, end of period | (5) |  | (7) |
Balance, beginning of period | 0 |  |  |
(Addition to) release of allowance for credit losses | 0 |  | 0 | (38)
Balance, end of period | 0 |  | 0 |
Balance, beginning of period | (8) |  |  |
Balance, end of period | (10) |  | (8) |
Balance, beginning of period | (223) |  | (213) | (263)
(Addition to) release of allowance for credit losses | (139) | [1] | (17) | 37
Write-offs, net of recoveries | 66 |  | 6 | 12
Change in foreign exchange | 1 |  |  | 1
Balance, end of period | (295) |  | (223) | (213)
Transitional real estate loans |  |  |  |
Allowance for Loan Losses by Portfolio Segment [Roll Forward] |  |  |  |
Balance, beginning of period | (54) |  | (68) | (63)
(Addition to) release of allowance for credit losses | (124) | [1] | 14 | (5)
Write-offs, net of recoveries | 66 |  | 0 | 0
Change in foreign exchange | 0 |  | 0 | 0
Balance, end of period | (112) |  | (54) | (68)
Allowance for credit loss accounted for as purchased financial assets with credit deterioration | 4 |  |  |
Commercial mortgage loans |  |  |  |
Allowance for Loan Losses by Portfolio Segment [Roll Forward] |  |  |  |
Balance, beginning of period | (9) |  | (10) | (32)
(Addition to) release of allowance for credit losses | (7) | [1] | 1 | 22
Write-offs, net of recoveries | 0 |  | 0 | 0
Change in foreign exchange | 0 |  | 0 | 0
Balance, end of period | (16) |  | (9) | (10)
Middle market loans |  |  |  |
Allowance for Loan Losses by Portfolio Segment [Roll Forward] |  |  |  |
Balance, beginning of period | (129) |  | (96) | (85)
(Addition to) release of allowance for credit losses | (17) | [1] | (39) | (11)
Write-offs, net of recoveries | 0 |  | 6 | 0
Change in foreign exchange | 0 |  | 0 | 0
Balance, end of period | (146) |  | (129) | (96)
Other loans and loan commitments |  |  |  |
Allowance for Loan Losses by Portfolio Segment [Roll Forward] |  |  |  |
Balance, beginning of period | (24) |  | (31) | (35)
(Addition to) release of allowance for credit losses | 8 | [1] | 7 | 4
Write-offs, net of recoveries | 0 |  | 0 | 0
Change in foreign exchange | 0 |  | 0 | 0
Balance, end of period | (16) |  | (24) | (31)
Held-to-maturity securities |  |  |  |
Allowance for Loan Losses by Portfolio Segment [Roll Forward] |  |  |  |
Balance, beginning of period | (7) |  | (8) | (10)
(Addition to) release of allowance for credit losses | 1 | [1] | 0 | 1
Write-offs, net of recoveries | 0 |  | 0 | 0
Change in foreign exchange | 1 |  | 1 | 1
Balance, end of period | (5) |  | (7) | (8)
Available-for-sale securities |  |  |  |
Allowance for Loan Losses by Portfolio Segment [Roll Forward] |  |  |  |
Balance, beginning of period | 0 |  | 0 | (38)
(Addition to) release of allowance for credit losses | 0 | [1] | 0 | 26
Write-offs, net of recoveries | 0 |  | 0 | 12
Change in foreign exchange | 0 |  | 0 | 0
Balance, end of period | $ 0 |  | $ 0 | $ 0
[1] | Includes an allowance for credit losses of $4 recognized on financial assets accounted for as purchased financial assets with credit deterioration that is not recorded in earnings upon recognition.

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- Definition Amount of 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
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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 -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
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