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Pension Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Amortization:        
Settlements     $ 13  
U.S.        
Components of net periodic pension cost        
Service cost $ 3 $ 4 9 $ 11
Interest cost 15 15 45 45
Expected asset return (22) (25) (65) (74)
Amortization:        
Amortization of actuarial loss 10 13 30 39
Net periodic pension cost 6 7 19 21
Non-U.S.        
Components of net periodic pension cost        
Service cost 3 4 9 11
Interest cost 7 7 22 23
Expected asset return (11) (13) (33) (40)
Amortization:        
Amortization of actuarial loss 3 3 7 10
Net periodic pension cost 2 $ 1 5 $ 4
Pension Benefit Plans | U.S.        
Amortization:        
Settlements $ 11   $ 13