FAIR VALUE DISCLOSURES - Carrying Values and Fair Values of Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Consolidated Amounts [Abstract]
Mortgage loans on real estate	$ 12,802	$ 12,107
Policy loans	4,123	3,735
Policyholders liabilities: Investment contracts	62,726	58,879
Separate Accounts liabilities	123,446	126,910
Carrying Value
Consolidated Amounts [Abstract]
Mortgage loans on real estate	12,802	12,107
Policy loans	4,123	3,735
Policyholders liabilities: Investment contracts	2,195	2,056
FHLB funding agreements	6,848	6,909
FABN funding agreements	1,143
Short-term and long-term debt	4,114	4,111
Separate Accounts liabilities	9,000	9,041
Measured at Fair Value
Consolidated Amounts [Abstract]
Mortgage loans on real estate	13,049	12,334
Policy loans	5,232	4,707
Policyholders liabilities: Investment contracts	2,425	2,167
FHLB funding agreements	6,940	6,957
FABN funding agreements	1,168
Short-term and long-term debt	4,750	4,476
Separate Accounts liabilities	9,000	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
FHLB funding agreements	0	0
FABN funding agreements	0
Short-term and long-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
FHLB funding agreements	6,940	6,957
FABN funding agreements	1,168
Short-term and long-term debt	4,750	4,476
Separate Accounts liabilities	0	0
Measured at Fair Value \| Level 3
Consolidated Amounts [Abstract]
Mortgage loans on real estate	13,049	12,334
Policy loans	5,232	4,707
Policyholders liabilities: Investment contracts	2,425	2,167
FHLB funding agreements	0	0
FABN funding agreements	0
Short-term and long-term debt	0	0
Separate Accounts liabilities	$ 9,000	$ 9,041

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Funds Backed By Reinsurance Agreements, Asset

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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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Amount of liability for variable contract in which all or portion of contract holder's funds is allocated to specific separate account and supported by assets held in separate account.

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