Benefit Expenses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Benefit Expenses
Defined Benefit Plan, Plan Assets, Contributions by Employer			$ 2
Other expense, net	$ 3	$ 3	7	$ 5
Income Tax Expense (Benefit)	2	8	7	3
Scenario, Forecast [Member]
Benefit Expenses
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	20		20
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	(1)	(1)	(1)	(1)
Benefit Expenses
Interest cost	(1)	(2)	(3)	(4)
Expected return on plan assets	2	3	4	5
Net pension (income) expense	2	1	2	1
Defined Benefit Plan, Amortization of Gain (Loss)	(1)	(1)	(1)	(1)
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits	(1)		(1)
Domestic Plan [Member]
Benefit Expenses
Interest cost	(6)	(7)	(12)	(15)
Expected return on plan assets	9	10	19	20
Net pension (income) expense	2	$ 3	5	$ 5
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits	$ (1)		$ (2)