FAIR VALUE DISCLOSURES - Carrying Values and Fair Values of Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Consolidated Amounts [Abstract]
Mortgage loans on real estate	$ 12,123	$ 12,107
Policy loans	3,720	3,735
Policyholders liabilities: Investment contracts	55,810	58,879
Separate Accounts liabilities	106,128	126,910
Carrying Value
Consolidated Amounts [Abstract]
Mortgage loans on real estate	12,123	12,107
Policy loans	3,720	3,735
Policyholders liabilities: Investment contracts	2,089	2,056
Funding Agreements	6,759	6,909
Short-term debt	4,217	4,111
Separate Accounts liabilities	7,563	9,041
Measured at Fair Value
Consolidated Amounts [Abstract]
Mortgage loans on real estate	12,134	12,334
Policy loans	4,686	4,707
Policyholders liabilities: Investment contracts	2,201	2,167
Funding Agreements	6,835	6,957
Short-term debt	4,201	4,476
Separate Accounts liabilities	7,563	9,041
Measured at Fair Value \| Level 1
Consolidated Amounts [Abstract]
Mortgage loans on real estate	0	0
Policy loans	0	0
Policyholders liabilities: Investment contracts	0	0
Funding Agreements	0	0
Short-term debt	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
Policyholders liabilities: Investment contracts	0	0
Funding Agreements	6,835	6,957
Short-term debt	4,201	4,476
Separate Accounts liabilities	0	0
Measured at Fair Value \| Level 3
Consolidated Amounts [Abstract]
Mortgage loans on real estate	12,134	12,334
Policy loans	4,686	4,707
Policyholders liabilities: Investment contracts	2,201	2,167
Funding Agreements	0	0
Short-term debt	0	0
Separate Accounts liabilities	$ 7,563	$ 9,041

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- Definition

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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Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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Amount of liability due to policyholder for deposit held under long-duration contract issued by insurance entity.

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