Pension and Postretirement Expense Level 4 (Details) - Amounts Recognized - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Other assets, net	$ (49)	$ (43)
Other Liabilities, Current	(135)	(159)
Liability, Defined Benefit Plan, Noncurrent	(262)	(246)
Accumulated Other Comprehensive Income (Loss), Net of Tax	8	39	$ 15
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net Amounts Recognized in Accumulated Other Comprehensive Income	1	3	$ 4
Pension Plan [Member] | UNITED STATES
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Other assets, net	0	0
Other Liabilities, Current	0	0
Liability, Defined Benefit Plan, Noncurrent	(25)	(35)
Accumulated Other Comprehensive Income (Loss), Net of Tax	0	0
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	(25)	(35)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit)	1	1
Deferred income taxes	(1)	(1)
Net Amounts Recognized in Accumulated Other Comprehensive Income	0	0
Defined Benefit Plan, Accumulated Benefit Obligation	238	242
Accumulated Benefit Obligation for Funded Plans	238	241
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation	238	242
Pension Benefits Fair Value of Plan Assets of Underfunded Plans	213	207
Pension Plans with Underfunded Accumulated Benefit Obligations [Abstract]
Aggregate Projected Benefit Obligation for Underfunded Pension Plans	238	242
Aggregate Projected Benefit Obligation for Underfunded Pension Plans	238	242
Aggregate Fair Value of Plan Assets for Underfunded Pension Plans	213	207
Pension plans with projected benefit obligation [Abstract]
Actuarial Gain from Plan Amendment	0	0
Pension Plan [Member] | Non-US [Member]
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Other assets, net	1	0
Pension Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Other Liabilities, Current	(5)	(4)
Liability, Defined Benefit Plan, Noncurrent	(220)	(195)
Accumulated Other Comprehensive Income (Loss), Net of Tax	0	(3)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	(224)	(202)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit)	(1)	(4)
Deferred income taxes	1	1
Net Amounts Recognized in Accumulated Other Comprehensive Income	0	(3)
Defined Benefit Plan, Accumulated Benefit Obligation	587	504
Accumulated Benefit Obligation for Funded Plans	393	350
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation	567	164
Pension Benefits Fair Value of Plan Assets of Underfunded Plans	391	9
Pension Plans with Underfunded Accumulated Benefit Obligations [Abstract]
Aggregate Projected Benefit Obligation for Underfunded Pension Plans	615	173
Aggregate Projected Benefit Obligation for Underfunded Pension Plans	615	548
Aggregate Fair Value of Plan Assets for Underfunded Pension Plans	391	349
Pension plans with projected benefit obligation [Abstract]
Actuarial Gain from Plan Amendment	2	0
Other Postretirement Benefits Plan [Member] | UNITED STATES
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Other assets, net	0	0
Other Liabilities, Current	0	0
Liability, Defined Benefit Plan, Noncurrent	(5)	(6)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(2)	(2)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	(7)	(8)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit)	0	(1)
Deferred income taxes	(2)	(1)
Net Amounts Recognized in Accumulated Other Comprehensive Income	(2)	(2)
Pension plans with projected benefit obligation [Abstract]
Actuarial Gain from Plan Amendment	0	0
Other Postretirement Benefits Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Other assets, net	0	0
Other Liabilities, Current	(1)	0
Liability, Defined Benefit Plan, Noncurrent	(10)	(10)
Accumulated Other Comprehensive Income (Loss), Net of Tax	1	2
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	(10)	(8)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit)	2	3
Deferred income taxes	(1)	(1)
Net Amounts Recognized in Accumulated Other Comprehensive Income	1	2
Pension plans with projected benefit obligation [Abstract]
Actuarial Gain from Plan Amendment	$ 0	$ 0