FAIR VALUE DISCLOSURES - CARRYING VALUES AND FAIR VALUES OF FINANCIAL INSTRUMENTS) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans on real estate	$ 12,053	$ 10,935
Loans to affiliates	800	703
Policyholders’ liabilities: Investment contracts	46,508	43,805
Funding Agreements	0	0
Policy loans	3,269	3,315
Separate Accounts liabilities	123,869	122,537
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans on real estate	12,053	10,935
Loans to affiliates	800	703
Policyholders’ liabilities: Investment contracts	2,020	2,068
Funding Agreements	3,012	3,014
Policy loans	3,269	3,315
Short-term and Long-term debt	398	769
Separate Accounts liabilities	8,231	7,537
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans on real estate	11,659	10,895
Loans to affiliates	804	700
Policyholders’ liabilities: Investment contracts	2,052	2,170
Funding Agreements	2,926	3,020
Policy loans	3,946	4,210
Short-term and Long-term debt	398	768
Separate Accounts liabilities	8,231	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 Accounts 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	804	700
Policyholders’ liabilities: Investment contracts	0	0
Funding Agreements	2,926	3,020
Policy loans	0	0
Short-term and Long-term debt	398	768
Separate Accounts liabilities	0	0
Fair Value \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans on real estate	11,659	10,895
Loans to affiliates	0	0
Policyholders’ liabilities: Investment contracts	2,052	2,170
Policy loans	3,946	4,210
Short-term and Long-term debt	0	0
Separate Accounts liabilities	$ 8,231	$ 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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