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Pension Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
U.S.        
Components of net periodic pension cost        
Service cost $ 3 $ 4 $ 6 $ 7
Interest cost 15 15 30 30
Expected asset return (22) (25) (44) (49)
Amortization:        
Amortization of Actuarial loss 10 13 20 26
Net periodic pension cost 6 7 12 14
Non-U.S.        
Components of net periodic pension cost        
Service cost 3 3 6 7
Interest cost 7 8 15 16
Expected asset return (11) (14) (22) (27)
Amortization:        
Amortization of Actuarial loss 3 $ 3 5 7
Net periodic pension cost $ 2   $ 4 $ 3