SIGNIFICANT ACCOUNTING POLICIES - Adoption of New Accounting Standards (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jan. 01, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle					$ 30					$ 30
Increase in net cash provided by operating activities	$ 513	$ 569	$ 449	$ 556	598	$ 733	$ 418	$ 509	$ 2,087	2,257	$ 2,312
Net cash (used in) provided by financing activities									$ (1,963)	13,624	(2,460)
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax asset												$ 30
Increase in net cash provided by operating activities										57	17
Net cash (used in) provided by financing activities										(57)	$ 17
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle					$ 30					$ 30
Retained Earnings | New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle												$ 30