FAIR VALUE DISCLOSURES (CARRYING VALUES AND FAIR VALUES OF FINANCIAL INSTRUMENTS) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Consolidated Amounts [Abstract]
Mortgage loans on real estate	$ 10,181	$ 9,757
Loans to affiliates	703	703
Policyholders' account balances, Investment contracts	40,308	38,842	$ 32,913
Policy loans	3,325	3,361
Short-term debt	608	513
Separate Accounts’ liabilities	114,939	111,403
Estimate of Fair Value
Consolidated Amounts [Abstract]
Mortgage loans on real estate	10,138	9,608
Loans to affiliates	775	775
Policyholders' account balances, Investment contracts	2,274	2,337
Funding Agreements	2,491	2,202
Policy loans	4,214	4,257
Short-term debt	608	513
Separate Accounts’ liabilities	6,555	6,194
Estimate of Fair Value \| Level 2
Consolidated Amounts [Abstract]
Loans to affiliates	775	775
Funding Agreements	2,491	2,202
Short-term debt	608	513
Estimate of Fair Value \| Level 3
Consolidated Amounts [Abstract]
Mortgage loans on real estate	10,138	9,608
Loans to affiliates	0	0
Policyholders' account balances, Investment contracts	2,274	2,337
Policy loans	4,214	4,257
Short-term debt	0	0
Separate Accounts’ liabilities	6,555	6,194
Carrying Value
Consolidated Amounts [Abstract]
Mortgage loans on real estate	10,181	9,757
Loans to affiliates	703	703
Policyholders' account balances, Investment contracts	2,173	2,226
Funding Agreements	2,528	2,255
Policy loans	3,325	3,361
Short-term debt	608	513
Separate Accounts’ liabilities	$ 6,555	$ 6,194

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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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- 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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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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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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