CONSOLIDATED INTERIM STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (105)	$ 52
Foreign exchange translation adjustment	110	39
Changes in fair value of effective cash flow hedges, net of tax (Note 15)	1
Total other comprehensive income, net of tax	111	39
Comprehensive income	$ 6	$ 91