Pension and Postretirement Expense Level 4 (Details) - Components of Net Pension and Non-pension postretirement Expense - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Postretirement Benefits Plan [Member] | UNITED STATES
Pension Benefits and Non-Pension Postretirement Benefits Disclosures Table Text Block [Line Items]
Service cost	$ 0	$ 0
Interest cost	0	0	$ 0
Amortization of prior service cost (benefit)	0	0	(1)
Unrealized actuarial loss (gain)	0	(1)	0
Net expense (benefit)	0	(1)	(1)
Other Postretirement Benefits Plan [Member] | Foreign Plan [Member]
Pension Benefits and Non-Pension Postretirement Benefits Disclosures Table Text Block [Line Items]
Service cost	0	0
Interest cost	1	1	1
Amortization of prior service cost (benefit)	0	0	0
Unrealized actuarial loss (gain)	2	1	(1)
Net expense (benefit)	3	2	0
Pension Plan [Member] | UNITED STATES
Pension Benefits and Non-Pension Postretirement Benefits Disclosures Table Text Block [Line Items]
Service cost	3	3	3
Interest cost	7	7	8
Expected return on assets	(14)	(13)	(14)
Amortization of prior service cost (benefit)	0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)		0	1
Unrealized actuarial loss (gain)	11	(6)	1
Net expense (benefit)	7	(9)	(1)
Pension Plan [Member] | Foreign Plan [Member]
Pension Benefits and Non-Pension Postretirement Benefits Disclosures Table Text Block [Line Items]
Service cost	17	16	14
Interest cost	10	9	10
Expected return on assets	(13)	(11)	(10)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	(1)	(1)
Unrealized actuarial loss (gain)	(26)	1	35
Net expense (benefit)	$ (12)	$ 14	$ 48