SIGNIFICANT ACCOUNTING POLICIES - Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amortization of intangible assets	$ 657	$ 664	$ 1,915	$ 2,015
Asset impairments	406	148	629	394
Operating income	$ (38)	863	$ (424)	716
Reclassification of Asset Impairment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amortization of intangible assets		664		2,015
Asset impairments		148		394
Acquired in-process research and development costs		31		34
Operating income		843		2,443
Reclassification of Asset Impairment | As Initially Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amortization of intangible assets		807		2,389
Asset impairments		0		0
Acquired in-process research and development costs		36		54
Operating income		843		2,443
Reclassification of Asset Impairment | Reclassification
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amortization of intangible assets		(143)		(374)
Asset impairments		148		394
Acquired in-process research and development costs		(5)		(20)
Operating income		$ 0		$ 0