Conversion from IFRS to U.S. GAAP - Consolidated Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Conversion from IFRS to U.S. GAAP
Depreciation and amortization									$ 449	$ 161	$ 72
Other expense (income), net									1	(39)	7
Income tax expense									(62)	(162)	(1)
Impairment losses, net									1,030
Net (loss) income	$ (950)	$ (289)	$ (40)	$ 15	$ 55	$ 2	$ 12	$ (11)	(1,264)	58	68
IFRS
Conversion from IFRS to U.S. GAAP
Net (loss) income	(961)	(433)	(18)	31	64	13	19	4	(1,381)	100	106
Adjustment
Conversion from IFRS to U.S. GAAP
Product and service costs									(88)	(105)	(71)
Depreciation and amortization									4	6	5
Interest expense, net									(4)	6	7
Other expense (income), net									7	25	(4)
Income tax expense									28	$ 26	$ 25
Impairment losses, net									$ 170
Net (loss) income	$ 11	$ 144	$ (22)	$ (16)	$ (9)	$ (11)	$ (7)	$ (15)