EQUITY - Components of OCI, Net of Taxes (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2017
Equity [Abstract]
Net unrealized gains (losses) arising during the period	$ 1,513	$ 1,342
(Gains) losses reclassified into net income (loss) during the period	(47)	9
Net unrealized gains (losses) on investments	1,466	1,351
Adjustments for policyholders’ liabilities, DAC, insurance liability loss recognition and other	(32)	(517)
Change in unrealized gains (losses), net of adjustments (net of deferred income tax expense (benefit) of $382 and $218)	1,434	834
Change in defined benefit plans:
Reclassification to Net income (loss) of amortization of net prior service credit included in net periodic cost	28	49
Change in defined benefit plans (net of deferred income tax expense (benefit) of $7 and $12)	28	49
Foreign currency translation adjustments:
Foreign currency translation gains (losses) arising during the period	(21)	(1)
(Gains) losses reclassified into net income (loss) during the period	0	0
Foreign currency translation adjustment	(21)	(1)
Total other comprehensive income (loss), net of income taxes	1,441	882	$ (1,177)
Less: Other comprehensive income (loss) attributable to noncontrolling interest	(8)	(1)
Other comprehensive income (loss) attributable to Holdings	1,449	883
Reclassification adjustment	(12)	2
AFS Securities, OCI, tax	382	218
Defined benefit plan, OCI, tax	$ 7	$ 12