Pensions Net Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension Plans, Defined Benefit [Member] | United States
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost (Income) [Abstract]
Discount rate	3.54%	4.06%	4.25%
Expected long-term rate of return on assets	5.75%	6.50%	7.00%
Components of Net Periodic Benefit Cost (Income) [Abstract]
Interest cost on benefit obligation	$ 41	$ 43	$ 51
Expected return on plan assets	(55)	(56)	(49)
Amortization of actuarial net loss	3	2
Settlement/curtailment loss		1
Net periodic benefit cost (income)	$ (11)	$ (10)	$ 2
Pension Plans, Defined Benefit [Member] | Foreign Plan [Member]
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost (Income) [Abstract]
Discount rate	2.10%	1.95%	2.83%
Average rate of increase in employee compensation	2.59%	3.10%	3.06%
Expected long-term rate of return on assets	3.31%	3.11%	3.74%
Components of Net Periodic Benefit Cost (Income) [Abstract]
Service cost-benefits earned	$ 26	$ 26	$ 24
Interest cost on benefit obligation	23	21	27
Expected return on plan assets	(32)	(29)	(28)
Amortization of actuarial net loss	7	9	7
Settlement/curtailment loss	7	5
Net periodic benefit cost (income)	31	32	$ 30
Postretirement Benefits [Member]
Components of Net Periodic Benefit Cost (Income) [Abstract]
Service cost-benefits earned	1	1
Interest cost on benefit obligation	$ 2	$ 2