Employee Benefit Plans - Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Components of Net Periodic Postretirement Benefit Cost
Service cost	$ 2	$ 2	$ 2
Interest cost	1	1	1
Amortization of prior service cost	(1)	(1)	(1)
Net periodic postretirement cost	2	2	2
Other Changes in Benefit Obligations Recognized in Other Comprehensive Income (Loss)
Net (gain) loss	0	(2)	3
Amortization of prior service cost	1	1	1
Total recognized in other comprehensive income	1	(1)	4
Total recognized in net periodic benefit cost (income) and other comprehensive income	$ 3	$ 1	$ 6