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INVESTMENTS - Commercial Mortgage and Other Loans by Portfolio Segment (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | [1] | Jun. 30, 2022 | Dec. 31, 2021
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Participating Mortgage Loans [Line Items] |  |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 13,133 |  |  | $ 13,688 |  |  |
Percent of total commercial mortgage and other loans | 100.00% |  |  | 100.00% |  |  |
Allowance for credit losses | $ (260) |  |  | $ (192) |  |  |
Total net commercial mortgage and other loans | 12,873 |  |  | 13,496 |  |  |
Transitional real estate loans |  |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 6,550 |  |  | $ 6,509 |  |  |
Percent of total commercial mortgage and other loans | 49.90% |  |  | 47.60% |  |  |
Allowance for credit losses | $ (111) | [1] | $ (76) | $ (54) | $ (55) | $ (53) | $ (68)
Commercial mortgage loans |  |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 1,734 |  |  | $ 2,022 |  |  |
Percent of total commercial mortgage and other loans | 13.20% |  |  | 14.80% |  |  |
Allowance for credit losses | $ (12) | [1] | (9) | $ (9) | (10) | (8) | (10)
Middle market loans |  |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 4,849 |  |  | $ 5,157 |  |  |
Percent of total commercial mortgage and other loans | 36.90% |  |  | 37.60% |  |  |
Allowance for credit losses | $ (137) | [1] | $ (140) | $ (129) | $ (117) | $ (109) | $ (96)
Office | Transitional real estate loans |  |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 1,912 |  |  | $ 2,158 |  |  |
Percent of total commercial mortgage and other loans | 14.60% |  |  | 15.80% |  |  |
Office | Commercial mortgage loans |  |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 375 |  |  | $ 388 |  |  |
Percent of total commercial mortgage and other loans | 2.90% |  |  | 2.80% |  |  |
Retail | Transitional real estate loans |  |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 471 |  |  | $ 493 |  |  |
Percent of total commercial mortgage and other loans | 3.60% |  |  | 3.60% |  |  |
Retail | Commercial mortgage loans |  |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 304 |  |  | $ 310 |  |  |
Percent of total commercial mortgage and other loans | 2.30% |  |  | 2.30% |  |  |
Apartment/Multi-Family | Transitional real estate loans |  |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 2,616 |  |  | $ 2,701 |  |  |
Percent of total commercial mortgage and other loans | 19.80% |  |  | 19.70% |  |  |
Apartment/Multi-Family | Commercial mortgage loans |  |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 604 |  |  | $ 630 |  |  |
Percent of total commercial mortgage and other loans | 4.60% |  |  | 4.60% |  |  |
Industrial | Transitional real estate loans |  |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 442 |  |  | $ 123 |  |  |
Percent of total commercial mortgage and other loans | 3.40% |  |  | 0.90% |  |  |
Industrial | Commercial mortgage loans |  |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 451 |  |  | $ 694 |  |  |
Percent of total commercial mortgage and other loans | 3.40% |  |  | 5.10% |  |  |
Hospitality | Transitional real estate loans |  |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 813 |  |  | $ 803 |  |  |
Percent of total commercial mortgage and other loans | 6.20% |  |  | 5.90% |  |  |
Other | Transitional real estate loans |  |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 296 |  |  | $ 231 |  |  |
Percent of total commercial mortgage and other loans | 2.30% |  |  | 1.70% |  |  |
[1] | Excludes allowance on firm loan commitments of $19 and $26 as of September 30, 2023 and 2022, respectively.

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