Pension Benefits - Summary of Net Periodic Benefit Cost (Details) - Pension Benefits - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
United States
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 1	$ 1
Expected return on plan assets	(3)	(3)
Net periodic benefit costs	(2)	(2)
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	2
Expected return on plan assets	(2)	(1)
Net periodic benefit costs	$ 1	$ 1