Restructuring, Facility Consolidation and Severance Charges (Restructuring Charges) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Severance, asset impairment and other restructuring charges	$ 57	$ 20	$ 83	$ 40
Restructuring Charges
Restructuring Cost and Reserve [Line Items]
Severance, asset impairment and other restructuring charges	57	20	83	40
Restructuring Charges | Western Hemisphere
Restructuring Cost and Reserve [Line Items]
Severance, asset impairment and other restructuring charges	26	10	41	15
Restructuring Charges | Eastern Hemisphere
Restructuring Cost and Reserve [Line Items]
Severance, asset impairment and other restructuring charges	11	2	17	7
Restructuring Charges | Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Severance, asset impairment and other restructuring charges	20	8	25	18
Restructuring Charges | Employee Severance
Restructuring Cost and Reserve [Line Items]
Severance costs	55	1	78	3
Restructuring Charges | Facility Consolidation and Other Charges
Restructuring Cost and Reserve [Line Items]
Other restructuring costs	2	15	5	29
Restructuring Charges | Asset Related Charges
Restructuring Cost and Reserve [Line Items]
Other restructuring costs	$ 0	$ 4	$ 0	$ 8