COMMITMENT AND CONTINGENT LIABILITIES - RESTRUCTURING ROLLFORWARD (Details) - AXA - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Employee Severance
Restructuring Cost and Reserve [Line Items]
Balance, beginning of year	$ 23	$ 22
Additions / Expense Incurred	6	17
Cash payments	(4)	(14)
Other reductions	0	(2)
Balance, end of Year	25	23
Facility Closing
Restructuring Cost and Reserve [Line Items]
Balance, beginning of year	165	170
Additions / Expense Incurred	0	29
Deferred rent	13	10
Cash payments	(32)	(48)
Interest accretion	7	4
Balance, end of Year	$ 153	$ 165