SIGNIFICANT ACCOUNTING POLICIES - Assumption Updates and Model Changes (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020
Change in Accounting Estimate [Line Items]
Policyholders’ benefits increase (decrease)	$ 700,000,000	$ 868,000,000	$ 3,297,000,000	$ 1,687,000,000
Policy charges and fee income	825,000,000	865,000,000	1,729,000,000	1,724,000,000
Interest credited to policyholder's account balances	(279,000,000)	(288,000,000)	(568,000,000)	(557,000,000)
Income (loss) from operations, before income taxes	(5,120,000,000)	318,000,000	2,070,000,000	(672,000,000)
Net income (loss)	$ (4,091,000,000)	$ 265,000,000	1,645,000,000	$ (563,000,000)
Long-term Lapses Partial Withdrawal Rates And Election Assumptions Updates
Change in Accounting Estimate [Line Items]
Policyholders’ benefits increase (decrease)			1,300,000,000
Amortization of deferred policy acquisition costs, net			861,000,000
Policy charges and fee income			54,000,000
Interest credited to policyholder's account balances			6,000,000
Income (loss) from operations, before income taxes			(2,100,000,000)
Net income (loss)			(1,700,000,000)
Economic Scenario Generator
Change in Accounting Estimate [Line Items]
Income (loss) from operations, before income taxes			165,000,000
Net income (loss)			$ 130,000,000
5-year Historical Average Over A 10-year Period
Change in Accounting Estimate [Line Items]
Interest rate assumptions					$ 0.0225