SIGNIFICANT ACCOUNTING POLICIES - Schedule of Restatements made to the Consolidated Statement of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net earnings (loss)	$ (313)	$ 1,752	$ 492	$ 1,490	$ 4,287
Universal life and investment-type product policy fee income	(896)	(815)	(3,435)	(3,341)	(3,182)
Interest credited to policyholders’ account balances	548	245	1,655	906	1,077
Increase (decrease) in the fair value of the reinsurance contract asset	(514)	1,629	(269)	(141)	3,962
Realized and unrealized (gains) losses on trading securities	(53)	(58)
Variable interest entities		0
Future policy benefits	127	540	744	1,001	2,013
Increase Decrease In Reinsurance Recoverable With Affiliate	44	234
Deferred policy acquisition costs	125	0	243	(312)	(375)
Amortization of deferred cost of reinsurance asset	50	9	159	121	278
Current and deferred income taxes	(327)	750	(857)	269	1,375
Accounts payable and accrued expenses		0
Other	(180)	(129)	(31)	(193)	59
Net cash provided by (used in) operating activities	18	190	(461)	(162)	(600)
Deposits	2,240	1,660	9,746	6,241	6,505
Policyholders' accounts balance transfer (to) from Separate Accounts	176	349	1,202	561	321
(Decrease) increase in overdrafts payable	50	(91)	(85)	(82)	(39)
Net cash provided by (used in) financing activities	$ 2,306	1,377	5,751	2,952	3,804
As previously reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net earnings (loss)		1,720	544	1,464	4,420
Universal life and investment-type product policy fee income		(901)	(3,423)	(3,208)	(3,115)
Interest credited to policyholders’ account balances		277	1,555	978	1,186
Increase (decrease) in the fair value of the reinsurance contract asset		1,637	(261)	(141)	3,964
Realized and unrealized (gains) losses on trading securities		(66)
Variable interest entities		(2)
Future policy benefits		572	783	934	1,647
Increase Decrease In Reinsurance Recoverable With Affiliate		145
Deferred policy acquisition costs		(10)	162	(331)	(413)
Amortization of deferred cost of reinsurance asset			159	39	302
Current and deferred income taxes		733	(771)	258	1,448
Accounts payable and accrued expenses		(2)
Other		(50)	(31)	(111)	98
Net cash provided by (used in) operating activities		99	(461)	(244)	(639)
Deposits			9,342	5,757	6,011
Policyholders' accounts balance transfer (to) from Separate Accounts			1,606	1,045	815
(Decrease) increase in overdrafts payable		0	(85)	0	0
Net cash provided by (used in) financing activities		1,468	5,751	3,034	3,843
Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net earnings (loss)		32	(52)	26	(133)
Universal life and investment-type product policy fee income		86	(12)	(133)	(67)
Interest credited to policyholders’ account balances			100	(72)	(109)
Increase (decrease) in the fair value of the reinsurance contract asset		(8)	(8)	0	(2)
Realized and unrealized (gains) losses on trading securities		8
Variable interest entities		2
Increase Decrease In Reinsurance Recoverable With Affiliate		89
Current and deferred income taxes		17	(86)	11	(73)
Accounts payable and accrued expenses		2
Other		(79)	0	(82)	(39)
Net cash provided by (used in) operating activities		91	0	82	39
Deposits			404	484	494
Policyholders' accounts balance transfer (to) from Separate Accounts			(404)	(484)	(494)
(Decrease) increase in overdrafts payable		(91)	0	(82)	(39)
Net cash provided by (used in) financing activities		$ (91)	$ 0	$ (82)	$ (39)