REVISION OF PRIOR PERIOD FINANCIAL STATEMENTS - Equity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 11,565	$ 12,359	$ 19,395
Net income (loss) attributable to Equitable Financial	(759)	(1,889)	(899)
Other comprehensive income (loss)	2,999	2,097	(1,225)
Ending balance	11,643	11,565	12,359
As Previously Reported
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	11,658	12,428
Net income (loss) attributable to Equitable Financial		(1,851)	(918)
Other comprehensive income (loss)		2,083	(1,234)
Ending balance		11,658	12,428
Impact of Revisions
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(93)	(69)
Net income (loss) attributable to Equitable Financial		(38)	19
Other comprehensive income (loss)		14	9
Ending balance		(93)	(69)
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	2,145	5,039	8,860
Net income (loss) attributable to Equitable Financial		(1,889)	(899)
Ending balance	(795)	2,145	5,039
Retained Earnings | As Previously Reported
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	2,242	5,098	8,938
Net income (loss) attributable to Equitable Financial		(1,851)	(918)
Ending balance		2,242	5,098
Retained Earnings | Impact of Revisions
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(97)	(59)	(78)
Net income (loss) attributable to Equitable Financial		(38)	19
Ending balance		(97)	(59)
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,596	(501)	579
Other comprehensive income (loss)	2,999	2,097	(1,225)
Ending balance	4,595	1,596	(501)
Accumulated Other Comprehensive Income (Loss) | As Previously Reported
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,592	(491)	598
Other comprehensive income (loss)		2,083	(1,234)
Ending balance		1,592	(491)
Accumulated Other Comprehensive Income (Loss) | Impact of Revisions
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	4	(10)	(19)
Other comprehensive income (loss)		14	9
Ending balance		4	(10)
Parent
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	11,552	12,347	16,300
Other comprehensive income (loss)	2,999	2,097	(1,225)
Ending balance	11,643	11,552	12,347
Parent | As Previously Reported
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	11,645	12,416
Ending balance		11,645	12,416
Parent | Impact of Revisions
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ (93)	(69)
Ending balance		$ (93)	$ (69)