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Pension Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]        
Payment for Pension Benefits     $ 11 $ 5
UNITED STATES        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic benefit cost $ 2 $ 5 4 11
UNITED STATES | General and Administrative Expense [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 2 3 4
UNITED STATES | Other pension (income) expense [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 10 9 20 18
Expected return on plan assets (11) (11) (22) (21)
Amortization of net loss 1 3 1 7
Amortization of prior service cost 1 2 2 3
Additional loss (gain) recognized due to settlements [1] $ 0 $ 0 $ 2 $ 0
[1]
Loss is a result of settlement transactions which exceeded the sum of annual service and interest costs for the applicable plan. These losses were recorded in Other pension (income) expense.