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Pension and Other Postretirement Healthcare Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Pensions    
Net periodic cost:    
Service cost $ 1 $ 1
Interest cost 3 5
Expected return on plan assets (6) (6)
Net amortization of actuarial loss and prior service credit 1 1
Total net periodic cost (1) 1
Other Postretirement Benefit Plans    
Net periodic cost:    
Total net periodic cost $ 1 $ 1