REVISION OF PRIOR PERIOD FINANCIAL STATEMENTS - Cash Flow (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flow from operating activities:
Net income (loss)	$ (759)	$ (1,884)	$ (902)
Net income (loss)	(759)	(1,884)	(339)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Policy charges and fee income	(3,464)	(3,487)	(3,515)
Interest credited to policyholder's account balances	1,118	1,149	979
Net derivative (gains) losses	1,541	3,831	1,034
Amortization and depreciation		391	360
Capitalization of DAC	(565)	(648)	(592)
Future policy benefits	1,857	1,084	(330)
Current and deferred income taxes	(306)	(329)	(563)
Net cash provided by (used in) operating activities	(768)	(606)	1,418
Cash and cash equivalents	$ 2,043	1,492	2,622	$ 3,409
Net income (loss) from discontinued operations			563
As Previously Reported
Cash flow from operating activities:
Net income (loss)		(1,846)	(921)
Net income (loss)			(358)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Policy charges and fee income		(3,450)	(3,523)
Interest credited to policyholder's account balances		1,127	1,002
Net derivative (gains) losses		3,820	1,010
Amortization and depreciation		323	340
Capitalization of DAC		(648)	(597)
Future policy benefits		1,115	(284)
Current and deferred income taxes		(334)	(556)
Net cash provided by (used in) operating activities		(606)	1,418
Cash and cash equivalents		1,492	2,622
Impact of Revisions
Cash flow from operating activities:
Net income (loss)		(38)	19
Net income (loss)			19
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Policy charges and fee income		(37)	8
Interest credited to policyholder's account balances		22	(23)
Net derivative (gains) losses		11	24
Amortization and depreciation		68	20
Capitalization of DAC		0	5
Future policy benefits		(31)	(46)
Current and deferred income taxes		5	(7)
Net cash provided by (used in) operating activities		0	0
Cash and cash equivalents		$ 0	$ 0