FAIR VALUE DISCLOSURES - CARRYING VALUES AND FAIR VALUES OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Consolidated Amounts [Abstract]
Mortgage loans on real estate	$ 12,090	$ 11,818
Policy loans	3,270	3,267
Loans to affiliates	0	572
Policyholders’ liabilities: Investment contracts	55,421	46,403
Loans from affiliates	0	572
Separate Accounts liabilities	124,646	108,487
Carrying Value
Consolidated Amounts [Abstract]
Mortgage loans on real estate	12,090	11,818
Policy loans	3,270	3,267
Loans to affiliates	1,200	600
Policyholders’ liabilities: Investment contracts	1,922	1,974
FHLBNY funding agreements	6,909	4,002
Loans from affiliates	0	572
Separate Accounts liabilities	9,041	7,406
Measured at Fair Value
Consolidated Amounts [Abstract]
Mortgage loans on real estate	12,317	11,478
Policy loans	4,199	3,944
Loans to affiliates	1,224	603
Policyholders’ liabilities: Investment contracts	2,029	2,015
FHLBNY funding agreements	6,957	3,956
Loans from affiliates	0	572
Separate Accounts liabilities	9,041	7,406
Measured at Fair Value \| Level 1
Consolidated Amounts [Abstract]
Mortgage loans on real estate	0	0
Policy loans	0	0
Loans to affiliates	0	0
Policyholders’ liabilities: Investment contracts	0	0
FHLBNY funding agreements	0	0
Loans from affiliates	0	0
Separate Accounts liabilities	0	0
Measured at Fair Value \| Level 2
Consolidated Amounts [Abstract]
Mortgage loans on real estate	0	0
Policy loans	0	0
Loans to affiliates	1,224	603
Policyholders’ liabilities: Investment contracts	0	0
FHLBNY funding agreements	6,957	3,956
Loans from affiliates	0	572
Separate Accounts liabilities	0	0
Measured at Fair Value \| Level 3
Consolidated Amounts [Abstract]
Mortgage loans on real estate	12,317	11,478
Policy loans	4,199	3,944
Loans to affiliates	0	0
Policyholders’ liabilities: Investment contracts	2,029	2,015
FHLBNY funding agreements	0	0
Loans from affiliates	0	0
Separate Accounts liabilities	$ 9,041	$ 7,406

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For an unclassified balance sheet, amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

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Carrying amount as of the balance sheet date of obligations due all related parties.

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Amount of the reinsurer's funds held on its behalf by the ceding insurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder.

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Amount before allowance of loans made to policy and contract holders using their life insurance contracts' cash value or separate accounts as collateral. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums over and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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