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INVESTMENTS - Commercial Mortgage Loans and Transitional Real Estate Loans by Key Credit Quality Indicators (Details) $ in Millions | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial mortgage and other loans, gross | $ 9,614 | $ 6,946
Weighted average debt-service coverage ratio | 2.38 | 2.45
Transitional real estate loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial mortgage and other loans, gross | $ 5,472 | $ 4,394
Commercial mortgage loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial mortgage and other loans, gross | 1,710 | 1,065
Commercial mortgage and transitional real estate loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial mortgage and other loans, gross | 7,182 | 5,459
Loan to Value Ratio, Zero to Fifty-nine Point Nine-nine Percent | Transitional real estate loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial mortgage and other loans, gross | 1,424 | 819
Loan to Value Ratio, Zero to Fifty-nine Point Nine-nine Percent | Commercial mortgage loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial mortgage and other loans, gross | 1,390 | 877
Loan to Value Ratio, Zero to Fifty-nine Point Nine-nine Percent | Commercial mortgage and transitional real estate loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial mortgage and other loans, gross | 2,814 | 1,696
Loan to Value Ratio, Sixty to Sixty-nine Point Nine-nine Percent | Transitional real estate loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial mortgage and other loans, gross | 1,927 | 1,681
Loan to Value Ratio, Sixty to Sixty-nine Point Nine-nine Percent | Commercial mortgage loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial mortgage and other loans, gross | 297 | 165
Loan to Value Ratio, Sixty to Sixty-nine Point Nine-nine Percent | Commercial mortgage and transitional real estate loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial mortgage and other loans, gross | 2,224 | 1,846
Loan to Value Ratio, Seventy to Seventy-nine Point Nine-nine Percent | Transitional real estate loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial mortgage and other loans, gross | 2,085 | 1,558
Loan to Value Ratio, Seventy to Seventy-nine Point Nine-nine Percent | Commercial mortgage loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial mortgage and other loans, gross | 23 | 23
Loan to Value Ratio, Seventy to Seventy-nine Point Nine-nine Percent | Commercial mortgage and transitional real estate loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial mortgage and other loans, gross | 2,108 | 1,581
Loan to Value Ratio Eighty Percent and Above | Transitional real estate loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial mortgage and other loans, gross | 36 | 336
Loan to Value Ratio Eighty Percent and Above | Commercial mortgage loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial mortgage and other loans, gross | 0 | 0
Loan to Value Ratio Eighty Percent and Above | Commercial mortgage and transitional real estate loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial mortgage and other loans, gross | $ 36 | $ 336

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- Definition 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 + Details
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