CLOSED BLOCK - Summarized Financial Information for Closed Block (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Closed Block Liabilities:
Future policy benefits, policyholders’ account balances and other	$ 6,201	$ 6,478
Policyholder dividend obligation	160	2	$ 0	$ 19
Other liabilities	39	38
Total Closed Block liabilities	6,400	6,518
Assets Designated to the Closed Block:
Fixed maturities available-for-sale, Amortized Cost	3,718	3,754
Mortgage loans on real estate (net of allowance for credit losses of $6 at December 31, 2020)	1,773	1,759
Policy loans	648	706
Cash and other invested assets	28	82
Other assets	169	145
Total assets designated to the Closed Block	6,336	6,446
Excess of Closed Block liabilities over assets designated to the Closed Block	64	72
Amounts included in accumulated other comprehensive income (loss):
Net unrealized investment gains (losses), net of policyholders’ dividend obligation: $160 and $2; and net of income tax: $(42) and $(41)	167	164
Maximum future earnings to be recognized from Closed Block assets and liabilities	231	236
Fixed maturities, available for sale, amortized cost	3,359	3,558
Fixed maturities available-for-sale, allowance for credit losses	0
Mortgage loans, credit losses	(6)
Policyholder dividend obligation	160	2	$ 0	$ 19
Closed block operations, income taxes	$ (42)	$ (41)

Assets Designated To Closed Block, Mortgage Loans On Real Estate, Credit Losses

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Closed Block Investments, Debt Securities, Available-for-sale, Allowance for Credit Loss

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The amount of deferred income tax expense or benefit allocated to the operations of the closed block for the period.

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Net increase or decrease in the period in the fair market value of investments that were allocated to the closed block net of deferred income tax (expense) benefit and policyholder dividend obligation.

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The sum of cash, cash equivalents, investments and other assets allocated to the segregated group of participating or dividend-paying policies and contracts identified as the closed block.

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Cash and highly liquid, safe investments that can be readily converted into cash (cash equivalents) allocated to the segregated group of participating or dividend-paying policies and contracts identified as the closed block.

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Fair value of investments in debt securities that are deemed to be available for sale that are allocated to the segregated group of participating or dividend-paying policies and contracts identified as the closed block. Change in fair of such securities is a component of change in other comprehensive income in the period, which is reflected in the closed block disclosure.

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Carrying amount of investments in mortgage loans on real estate allocated to the segregated group of participating or dividend-paying policies and contracts identified as the closed block.

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Amount of other assets held by the closed block. Excludes other investments.

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Carrying amount of loans to policy holders secured by benefits under insurance policies that are allocated to the segregated group of participating or dividend-paying policies and contracts identified as the closed block.

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The carrying amount of closed block liabilities in excess of the carrying amount of closed block assets at the date of demutualization (adjusted to eliminate the impact of related amounts in accumulated other comprehensive income).

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The amortized cost as of the balance sheet date of those fixed maturity investments designated as available for sale and reported at fair value which are allocated to the closed block. Also a component of change in other comprehensive income in the period, which is reflected in the closed block disclosure.

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For the segregated group of participating or dividend-paying policies and contracts along with the assets backing them (known as a closed block), the total of future policy benefits, policyholder account balance, policyholder dividend obligation and any other closed block liabilities.

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The liability as of the balance sheet date for future benefits to be paid to or on behalf of policyholders and expenses, less the present value of future net premiums payable under the insurance contracts and the policy cash accumulations, for the segregated group of participating or dividend-paying policies and contracts identified as a closed block.

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Amount of liabilities allocated to the closed block, classified as other.

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The liability as of the balance sheet date for the excess of the cumulative actual closed block earnings over the cumulative expected (actuarially determined) closed block earnings (each) for the period from the actuarial calculation date to the date of measurement. The excess will result in future dividends to closed block policyholders, unless offset by less favorable than expected future performance of the closed block. The policyholder dividend obligation, which may not have a negative balance, recognizes that a portion of earnings in certain cases will not inure to the stockholders of the insurance entity.

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The difference between the liabilities of and the assets allocated to the segregated group of participating or dividend-paying policies and contracts identified as the closed block.

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