Restructuring and Transformation Charges (Restructuring Charges) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]
Severance, asset impairment and other restructuring charges	$ 20	$ 25
2016-17 Plan [Member]
Restructuring Cost and Reserve [Line Items]
Severance, asset impairment and other restructuring charges		25
2016-17 Plan [Member] | Western Hemisphere
Restructuring Cost and Reserve [Line Items]
Severance, asset impairment and other restructuring charges		4
2016-17 Plan [Member] | Eastern Hemisphere
Restructuring Cost and Reserve [Line Items]
Severance, asset impairment and other restructuring charges		9
2016-17 Plan [Member] | Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Severance, asset impairment and other restructuring charges		12
2016-17 Plan [Member] | Employee Severance
Restructuring Cost and Reserve [Line Items]
Severance costs		11
2016-17 Plan [Member] | Employee Severance | Western Hemisphere
Restructuring Cost and Reserve [Line Items]
Severance costs		4
2016-17 Plan [Member] | Employee Severance | Eastern Hemisphere
Restructuring Cost and Reserve [Line Items]
Severance costs		4
2016-17 Plan [Member] | Employee Severance | Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Severance costs		3
2016-17 Plan [Member] | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Other restructuring costs		14
2016-17 Plan [Member] | Other Restructuring | Western Hemisphere
Restructuring Cost and Reserve [Line Items]
Other restructuring costs		0
2016-17 Plan [Member] | Other Restructuring | Eastern Hemisphere
Restructuring Cost and Reserve [Line Items]
Other restructuring costs		5
2016-17 Plan [Member] | Other Restructuring | Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Other restructuring costs		$ 9
Transformation Plan [Member]
Restructuring Cost and Reserve [Line Items]
Severance, asset impairment and other restructuring charges	20
Transformation Plan [Member] | Western Hemisphere
Restructuring Cost and Reserve [Line Items]
Severance, asset impairment and other restructuring charges	5
Transformation Plan [Member] | Eastern Hemisphere
Restructuring Cost and Reserve [Line Items]
Severance, asset impairment and other restructuring charges	5
Transformation Plan [Member] | Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Severance, asset impairment and other restructuring charges	10
Transformation Plan [Member] | Employee Severance
Restructuring Cost and Reserve [Line Items]
Severance costs	2
Transformation Plan [Member] | Employee Severance | Western Hemisphere
Restructuring Cost and Reserve [Line Items]
Severance costs	1
Transformation Plan [Member] | Employee Severance | Eastern Hemisphere
Restructuring Cost and Reserve [Line Items]
Severance costs	1
Transformation Plan [Member] | Employee Severance | Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Severance costs	0
Transformation Plan [Member] | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Other restructuring costs	18
Transformation Plan [Member] | Other Restructuring | Western Hemisphere
Restructuring Cost and Reserve [Line Items]
Other restructuring costs	4
Transformation Plan [Member] | Other Restructuring | Eastern Hemisphere
Restructuring Cost and Reserve [Line Items]
Other restructuring costs	4
Transformation Plan [Member] | Other Restructuring | Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Other restructuring costs	$ 10