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Pension Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
U.S.        
Components of net periodic pension cost        
Service cost $ 4 $ 4 $ 11 $ 11
Interest cost 15 20 45 59
Expected asset return (25) (33) (74) (98)
Amortization:        
Amortization of Actuarial loss 13 14 39 44
Net periodic pension cost 7 5 21 16
Non-U.S.        
Components of net periodic pension cost        
Service cost 4 4 11 12
Interest cost 7 11 23 33
Expected asset return (13) (18) (40) (54)
Amortization:        
Amortization of Actuarial loss 3 5 10 15
Net periodic pension cost $ 1 $ 2 $ 4 $ 6