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Restructuring Charges (Restructuring Charges) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2019	Jun. 30, 2019	Dec. 13, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 12, 2019	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 0	$ 61	$ 189		$ 126	$ 183
Severance and Other Restructuring Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	66			$ 66	59	61	$ 66	$ 86
2016-17 Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges					126
2016-17 Plan [Member] \| Western Hemisphere [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges					27
2016-17 Plan [Member] \| Eastern Hemisphere [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges					45
2016-17 Plan [Member] \| Corporate, Non-Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges					54
2016-17 Plan [Member] \| Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs					$ 61
Transformation Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0		189	$ 189
Transformation Plan [Member] \| Western Hemisphere [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0		84
Transformation Plan [Member] \| Eastern Hemisphere [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0		50
Transformation Plan [Member] \| Corporate, Non-Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 0		55
Transformation Plan [Member] \| Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs			$ 53
2016 Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges						183
2016 Plan [Member] \| Western Hemisphere [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges						70
2016 Plan [Member] \| Eastern Hemisphere [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges						77
2016 Plan [Member] \| Corporate, Non-Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges						36
2016 Plan [Member] \| Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs						$ 109