SHARE-BASED AND OTHER COMPENSATION PROGRAMS - Stock Option Activity (Details) - 12 months ended Dec. 31, 2019 € / shares in Units, $ / shares in Units, € in Thousands, shares in Thousands, $ in Thousands	USD ($) $ / shares shares	USD ($) $ / shares € / shares shares	EUR (€) € / shares shares
EQH Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, Number Outstanding, Beginning Balance (in shares)	835	835
Options granted (in shares)	1,251	1,251
Options exercised (in shares)	23	23
Options forfeited, net (in shares)	133	133
Options expired/reinstated (in shares)	0	0
Options, Number Outstanding, Ending Balance (in shares)	1,930	1,930
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Options, Weighted Average Exercise Price, Beginning Balance (in dollars per share) | $ / shares	$ 21.34
Options granted, Weighted Average Exercise Price (in dollars per share) | $ / shares	18.74
Options exercised, Weighted Average Exercise Price (in dollars per share) | $ / shares	21.34
Options forfeited, net, Weighted Average Exercise Price (in dollars per share) | $ / shares	20.29
Options expired/reinstated, Weighted Average Exercise Price (in dollars per share) | $ / shares	0.00
Options, Weighted Average Exercise Price, Ending Balance (in dollars per share) | $ / shares	$ 19.73
Options Outstanding, Aggregate Intrinsic Value | $	$ 9,755	$ 9,755
Weighted Average Remaining Contractual Term (in years)	8 years 10 months 6 days	8 years 10 months 6 days
Options Exercisable (in shares)	250	250	250
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 21.34	$ 21.34
Options Exercisable, Aggregate Intrinsic Value | $	$ 859	$ 859
Weighted Average Remaining Contractual Term (in years)	8 years 5 months 5 days	8 years 5 months 5 days
AXA Ordinary Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, Number Outstanding, Beginning Balance (in shares)	2,609	2,609
Options granted (in shares)	156	156
Options exercised (in shares)	856	856
Options forfeited, net (in shares)	182	182
Options expired/reinstated (in shares)	0	0
Options, Number Outstanding, Ending Balance (in shares)	1,727	1,727
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Options, Weighted Average Exercise Price, Beginning Balance (in dollars per share) | $ / shares	$ 18.20
Options granted, Weighted Average Exercise Price (in dollars per share) | € / shares		$ 21.60
Options exercised, Weighted Average Exercise Price (in dollars per share) | $ / shares	16.40
Options forfeited, net, Weighted Average Exercise Price (in dollars per share) | € / shares		$ 19.72
Options expired/reinstated, Weighted Average Exercise Price (in dollars per share) | $ / shares	0.00
Options, Weighted Average Exercise Price, Ending Balance (in dollars per share) | $ / shares	$ 20.09
Options Outstanding, Aggregate Intrinsic Value | €			€ 8,661
Weighted Average Remaining Contractual Term (in years)	5 years 2 months 12 days	5 years 2 months 12 days
Options Exercisable (in shares)	1,527	1,527	1,527
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | € / shares			€ 19.74
Options Exercisable, Aggregate Intrinsic Value | €			€ 8,207
Weighted Average Remaining Contractual Term (in years)	4 years 10 months 6 days	4 years 10 months 6 days
AXA ADRs
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, Number Outstanding, Beginning Balance (in shares)	15	15
Options granted (in shares)	0	0
Options exercised (in shares)	15	15
Options forfeited, net (in shares)	0	0
Options expired/reinstated (in shares)	0	0
Options, Number Outstanding, Ending Balance (in shares)	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Options, Weighted Average Exercise Price, Beginning Balance (in dollars per share) | $ / shares	$ 15.37
Options granted, Weighted Average Exercise Price (in dollars per share) | $ / shares	0.00
Options exercised, Weighted Average Exercise Price (in dollars per share) | $ / shares	15.37
Options forfeited, net, Weighted Average Exercise Price (in dollars per share) | $ / shares	0.00
Options expired/reinstated, Weighted Average Exercise Price (in dollars per share) | $ / shares	0.00
Options, Weighted Average Exercise Price, Ending Balance (in dollars per share) | $ / shares	$ 0.00
Options Outstanding, Aggregate Intrinsic Value | $	$ 0	$ 0
Options Exercisable (in shares)	0	0	0
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 0.00	$ 0.00
Options Exercisable, Aggregate Intrinsic Value | $	$ 0	$ 0