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Benefit Expenses (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2018
Scenario, Forecast [Member]          
Benefit Expenses          
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year         $ 7
Foreign Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Service Cost $ (1) $ (1) $ (1) $ (1)  
Benefit Expenses          
Interest cost (2) (2) (4) (4)  
Expected return on plan assets 3 2 5 4  
Net pension (income) expense (1) (2) (1) (2)  
Defined Benefit Plan, Plan Assets, Contributions by Employer     3    
Defined Benefit Plan, Amortization of Gain (Loss) (1) (1) (1) (1)  
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits     0 0  
Domestic Plan [Member]          
Benefit Expenses          
Interest cost (7) (7) (14) (14)  
Expected return on plan assets 10 10 20 20  
Net pension (income) expense $ 3 $ 3 5 $ 6  
Defined Benefit Plan, Plan Assets, Contributions by Employer     1    
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits     $ (1)