INCOME TAXES - Tax Effect of Major Items Recorded as Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Tax loss carryforwards	$ 2,911	$ 2,886
Provisions	641	519
Research and development tax credits	155	143
Scientific Research and Experimental Development pool	52	52
Tax credit carryforwards	25	46
Deferred revenue	5	4
Unrealized FX on U.S. dollar debt and other financing cost	94	262
Prepaid expenses	41	44
Share-based compensation	19	24
Other	23	0
Total deferred tax assets	3,966	3,980
Less valuation allowance	(2,831)	(2,913)
Net deferred tax assets	1,135	1,067
Deferred tax liabilities:
Intangible assets	53	163
Plant, equipment and technology	56	55
Outside basis differences	41	29
Other	0	29
Total deferred tax liabilities	150	276
Net deferred tax asset	$ 985	$ 791