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Pension Benefits Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Non-U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 4 $ 5 $ 13 $ 15
Interest cost 7 9 21 21
Expected return on plan assets (6) (8) (19) (20)
Curtailment loss 0 1 1 4
Amortization of actuarial losses 4 5 11 10
Net periodic benefit cost 9 12 27 30
U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 0 0 0
Interest cost 0 0 0 1
Expected return on plan assets 0 0 0 0
Curtailment loss 0 0 0 0
Amortization of actuarial losses 0 0 1 0
Net periodic benefit cost $ 0 $ 0 $ 1 $ 1