Pension and Postretirement Expense Level 4 (Details) - Amounts Recognized in Other Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Loss recognized from pension and postretirement benefits			$ 0
UNITED STATES
Prior Service Cost from Plan Amendments	$ 0
Amortization of prior service cost	0
Loss recognized from pension and postretirement benefits	0
Foreign Plan [Member]
Amortization of prior service cost	0
Loss recognized from pension and postretirement benefits	2
Pension Plan [Member] | UNITED STATES
Prior Service Cost from Plan Amendments	0
Amortization of prior service cost	0	$ (1)	0
Loss recognized from pension and postretirement benefits	0
Pension Plan [Member] | Non-US [Member]
Prior Service Cost from Plan Amendments	2
Pension Plan [Member] | Foreign Plan [Member]
Amortization of prior service cost	1	$ 1	$ 0
Loss recognized from pension and postretirement benefits	3
Other Postretirement Benefits Plan [Member]
Prior Service Cost from Plan Amendments	2
Other Postretirement Benefits Plan [Member] | UNITED STATES
Prior Service Cost from Plan Amendments	0
Amortization of prior service cost	0
Loss recognized from pension and postretirement benefits	0
Other Postretirement Benefits Plan [Member] | Foreign Plan [Member]
Prior Service Cost from Plan Amendments	0
Amortization of prior service cost	1
Loss recognized from pension and postretirement benefits	$ (1)