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Pension Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
U.S.    
Components of net periodic pension cost    
Service cost $ 3 $ 4
Interest cost 15 15
Expected asset return (22) (25)
Amortization:    
Amortization of Actuarial loss 10 13
Net periodic pension cost 6 7
Non-U.S.    
Components of net periodic pension cost    
Service cost 3 4
Interest cost 8 8
Expected asset return (12) (13)
Amortization:    
Amortization of Actuarial loss 3 4
Net periodic pension cost $ 2 $ 3