FAIR VALUE DISCLOSURES - CARRYING VALUES AND FAIR VALUES OF FINANCIAL INSTRUMENTS) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans on real estate	$ 11,316	$ 10,935
Loans to affiliates	702	703
Policyholders’ liabilities: Investment contracts	44,260	43,805	$ 40,292
Funding Agreements	0	0
Policy loans	3,305	3,315
Separate Account Liabilities	119,868	122,537
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans on real estate	11,316	10,935
Loans to affiliates	702	703
Policyholders’ liabilities: Investment contracts	3,018	2,068
Funding Agreements	3,014	3,014
Policy loans	3,305	3,315
Short-term and Long-term debt	490	769
Separate Account Liabilities	7,647	7,537
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans on real estate	11,111	10,895
Loans to affiliates	702	700
Policyholders’ liabilities: Investment contracts	2,949	2,170
Funding Agreements	2,962	3,020
Policy loans	4,073	4,210
Short-term and Long-term debt	490	768
Separate Account Liabilities	7,647	7,537
Fair Value \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans on real estate	0	0
Loans to affiliates	0	0
Policyholders’ liabilities: Investment contracts	0	0
Policy loans	0	0
Short-term and Long-term debt	0	0
Separate Account Liabilities	0	0
Fair Value \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans on real estate	0	0
Loans to affiliates	702	700
Policyholders’ liabilities: Investment contracts	0	0
Funding Agreements	2,962	3,020
Policy loans	0	0
Short-term and Long-term debt	490	768
Separate Account Liabilities	0	0
Fair Value \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans on real estate	11,111	10,895
Loans to affiliates	0	0
Policyholders’ liabilities: Investment contracts	2,949	2,170
Policy loans	4,073	4,210
Short-term and Long-term debt	0	0
Separate Account Liabilities	$ 7,647	$ 7,537

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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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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Total carrying amount of mortgage loans as of the balance sheet date.

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The liability as of the balance sheet date to the policyholders for deposits held under the terms of insurance contracts.

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Amount of liability for variable contracts that meet specified criteria that are backed by assets held in separate accounts and carried at the fair value of those assets.

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