Restructuring Charges (Restructuring Liability) (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
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 0	$ 61	$ 189		$ 126	$ 183
Restructuring Reserve [Roll Forward]
Other			(12)
Severance and Other Restructuring Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0		152		120	171
Restructuring Reserve [Roll Forward]
Accrued balance at beginning of period			59	$ 59	61	86
Cash Payments	0		(120)		(109)	(167)
Other			25		13	29
Accrued balance at end of period	66			66	$ 59	$ 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