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INVESTMENTS - Commercial Mortgage and Other Loans by Portfolio Segment (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | [1]
--- | --- | --- | --- | --- | --- | --- | ---
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 11,553 |  | $ 10,734 |  |  |
Percent of total commercial mortgage and other loans | 100.00% |  | 100.00% |  |  |
Allowance for credit losses | $ (165) |  | $ (180) |  |  |
Total net commercial mortgage and other loans | 11,388 |  | 10,554 |  |  |
Transitional real estate loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 5,211 |  | $ 5,294 |  |  |
Percent of total commercial mortgage and other loans | 45.10% |  | 49.30% |  |  |
Allowance for credit losses | $ (59) | $ (41) | $ (63) | $ (53) | $ (66) | $ (22)
Commercial mortgage loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 1,861 |  | $ 1,720 |  |  |
Percent of total commercial mortgage and other loans | 16.10% |  | 16.00% |  |  |
Allowance for credit losses | $ (17) | (22) | $ (32) | (28) | (42) | (3)
Middle market loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 4,481 |  | $ 3,720 |  |  |
Percent of total commercial mortgage and other loans | 38.80% |  | 34.70% |  |  |
Allowance for credit losses | $ (89) | $ (76) | $ (85) | $ (84) | $ (134) | $ (20)
Office | Transitional real estate loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 1,944 |  | $ 2,115 |  |  |
Percent of total commercial mortgage and other loans | 16.80% |  | 19.70% |  |  |
Office | Commercial mortgage loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 395 |  | $ 401 |  |  |
Percent of total commercial mortgage and other loans | 3.40% |  | 3.70% |  |  |
Retail | Transitional real estate loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 140 |  | $ 125 |  |  |
Percent of total commercial mortgage and other loans | 1.20% |  | 1.20% |  |  |
Retail | Commercial mortgage loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 334 |  | $ 340 |  |  |
Percent of total commercial mortgage and other loans | 3.00% |  | 3.20% |  |  |
Apartment/Multi-Family | Transitional real estate loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 1,666 |  | $ 1,782 |  |  |
Percent of total commercial mortgage and other loans | 14.40% |  | 16.60% |  |  |
Apartment/Multi-Family | Commercial mortgage loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 640 |  | $ 588 |  |  |
Percent of total commercial mortgage and other loans | 5.50% |  | 5.50% |  |  |
Industrial | Transitional real estate loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 46 |  | $ 85 |  |  |
Percent of total commercial mortgage and other loans | 0.40% |  | 0.80% |  |  |
Industrial | Commercial mortgage loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 478 |  | $ 391 |  |  |
Percent of total commercial mortgage and other loans | 4.10% |  | 3.60% |  |  |
Hospitality | Transitional real estate loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 1,075 |  | $ 1,106 |  |  |
Percent of total commercial mortgage and other loans | 9.30% |  | 10.30% |  |  |
Other | Transitional real estate loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 340 |  | $ 81 |  |  |
Percent of total commercial mortgage and other loans | 3.00% |  | 0.70% |  |  |
Other | Commercial mortgage loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 14 |  | $ 0 |  |  |
Percent of total commercial mortgage and other loans | 0.10% |  | 0.00% |  |  |
[1] | U.S. GAAP guidance adopted as of January 1, 2020 has superseded these losses, included for comparative purposes only.

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- Definition Percent of amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References No definition available. + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=122038336&loc=d3e74567-122707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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