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INVESTMENTS - Commercial Mortgage and Other Loans by Property Type (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Participating Mortgage Loans [Line Items] |  |
Commercial mortgage and other loans, gross | $ 9,614 | $ 6,946
Percent of total commercial mortgage and other loans | 100.00% | 100.00%
Valuation allowance | $ (45) | $ (27)
Total net commercial mortgage and other loans | 9,569 | 6,919
Transitional real estate loans |  |
Participating Mortgage Loans [Line Items] |  |
Commercial mortgage and other loans, gross | $ 5,472 | $ 4,394
Percent of total commercial mortgage and other loans | 57.00% | 63.20%
Valuation allowance | $ (22) | $ (17)
Commercial mortgage loans |  |
Participating Mortgage Loans [Line Items] |  |
Commercial mortgage and other loans, gross | $ 1,710 | $ 1,065
Percent of total commercial mortgage and other loans | 17.70% | 15.40%
Valuation allowance | $ (3) | $ (1)
Middle market loans |  |
Participating Mortgage Loans [Line Items] |  |
Commercial mortgage and other loans, gross | $ 2,432 | $ 1,487
Percent of total commercial mortgage and other loans | 25.30% | 21.40%
Valuation allowance | $ (20) | $ (9)
Office | Transitional real estate loans |  |
Participating Mortgage Loans [Line Items] |  |
Commercial mortgage and other loans, gross | $ 1,800 | $ 1,621
Percent of total commercial mortgage and other loans | 18.70% | 23.30%
Office | Commercial mortgage loans |  |
Participating Mortgage Loans [Line Items] |  |
Commercial mortgage and other loans, gross | $ 410 | $ 281
Percent of total commercial mortgage and other loans | 4.30% | 4.10%
Retail | Transitional real estate loans |  |
Participating Mortgage Loans [Line Items] |  |
Commercial mortgage and other loans, gross | $ 131 | $ 147
Percent of total commercial mortgage and other loans | 1.40% | 2.10%
Retail | Commercial mortgage loans |  |
Participating Mortgage Loans [Line Items] |  |
Commercial mortgage and other loans, gross | $ 348 | $ 316
Percent of total commercial mortgage and other loans | 3.50% | 4.60%
Apartments/Multi-Family | Transitional real estate loans |  |
Participating Mortgage Loans [Line Items] |  |
Commercial mortgage and other loans, gross | $ 2,085 | $ 1,706
Percent of total commercial mortgage and other loans | 21.70% | 24.60%
Apartments/Multi-Family | Commercial mortgage loans |  |
Participating Mortgage Loans [Line Items] |  |
Commercial mortgage and other loans, gross | $ 569 | $ 369
Percent of total commercial mortgage and other loans | 5.90% | 5.30%
Industrial | Transitional real estate loans |  |
Participating Mortgage Loans [Line Items] |  |
Commercial mortgage and other loans, gross | $ 256 | $ 250
Percent of total commercial mortgage and other loans | 2.70% | 3.60%
Industrial | Commercial mortgage loans |  |
Participating Mortgage Loans [Line Items] |  |
Commercial mortgage and other loans, gross | $ 383 | $ 99
Percent of total commercial mortgage and other loans | 4.00% | 1.40%
Hospitality | Transitional real estate loans |  |
Participating Mortgage Loans [Line Items] |  |
Commercial mortgage and other loans, gross | $ 1,036 | $ 531
Percent of total commercial mortgage and other loans | 10.80% | 7.60%
Other | Transitional real estate loans |  |
Participating Mortgage Loans [Line Items] |  |
Commercial mortgage and other loans, gross | $ 164 | $ 139
Percent of total commercial mortgage and other loans | 1.70% | 2.00%

X
- 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://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 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=118936363&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=118939070&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=118936363&loc=SL6953423-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -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=27010918&loc=d3e74567-122707 + Details
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