SIGNIFICANT ACCOUNTING POLICIES - ASSUMPTION UPDATES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Change in Accounting Estimate [Line Items]
Amortization of deferred policy acquisition cost, net	$ 82	$ 74	$ (43)	$ 74	$ (222)	$ 313	$ 374
Universal life and investment-type product policy fee income	(865)	(841)	(1,761)	(1,656)	(3,435)	(3,340)	(3,181)
Policyholders’ benefits	1,467	1,284	2,300	2,402	2,828	2,840	4,047
Increase (decrease) in the fair value of the reinsurance contract asset	1,495	1,104	981	2,733	(269)	(141)	3,962
Amortization of deferred cost of reinsurance assets			171	(64)	(159)	(121)	(278)
Net earnings (loss)	1,459	1,071	1,146	2,823	$ 506	$ 1,490	$ 4,286
Variable and Interest Sensitive Life
Change in Accounting Estimate [Line Items]
Net earnings (loss)		(14)		(14)
Long-term lapse and partial withdrawal behavior
Change in Accounting Estimate [Line Items]
Amortization of deferred policy acquisition cost, net	32		32
Policyholders’ benefits	602		602
Increase (decrease) in the fair value of the reinsurance contract asset	1,532		1,532
Amortization of deferred cost of reinsurance assets	226		226
Net earnings (loss)	$ 772		$ 772
Mortality Assumption | Variable and Interest Sensitive Life
Change in Accounting Estimate [Line Items]
Amortization of deferred policy acquisition cost, net		70		70
Universal life and investment-type product policy fee income		16		16
General Account Spread Assumption | Variable and Interest Sensitive Life
Change in Accounting Estimate [Line Items]
Amortization of deferred policy acquisition cost, net		(79)		(79)
Universal life and investment-type product policy fee income		$ (4)		$ (4)