Pension and Other Postretirement Healthcare Benefits, Components of Net Periodic Pension and Postretirement Healthcare Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pensions
Net periodic cost:
Service cost	$ 4	$ 5	$ 4
Interest cost	14	17	21
Expected return on plan assets	(26)	(22)	(22)
Net amortization of actuarial loss	5	4	2
Settlement losses (gains)	0	0	(1)
Curtailment (gains)	0	(2)	0
Total net periodic cost - continuing operations	(3)	2	4
Other Post Retirement Benefit Plans
Net periodic cost:
Service cost	1	0	0
Interest cost	2	1	1
Expected return on plan assets	0	0	0
Net amortization of actuarial loss	1	0	0
Settlement losses (gains)	0	0	0
Curtailment (gains)	0	0	0
Total net periodic cost - continuing operations	$ 4	$ 1	$ 1