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Pension Benefits (Details) - UNITED STATES - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items]    
Net periodic benefit cost $ 6 $ 5
General and Administrative Expense [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 2 2
Other pension (income) expense [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 8 9
Expected return on plan assets (11) (11)
Amortization of net loss 6 4
Amortization of prior service cost $ 1 $ 1