Restructuring Charges (Narrative) (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 Reserve, Translation and Other Adjustment			$ 12
Restructuring Charges	$ 0	$ 61	189		$ 126	$ 183
Severance and Other Restructuring Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Translation and Other Adjustment			(25)		(13)	(29)
Restructuring and Related Cost, Incurred Cost	0		152		120	171
Payments for Restructuring	0		120		109	167
Transformation Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 0		189	$ 189
Transformation Plan [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs			53
Transformation Plan [Member] | Other Restructuring excluding write-downs [Member]
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs			99
2016-17 Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges					126
2016-17 Plan [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs					61
2016-17 Plan [Member] | Other Restructuring excluding write-downs [Member]
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs					$ 59
2016-17 Plan [Member] | Impaired Assets to be Disposed of by Method Other than Sale, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs			$ 37			6
2016 Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges						183
2016 Plan [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs						109
2016 Plan [Member] | Other Restructuring excluding write-downs [Member]
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs						62
2016 Plan [Member] | Impaired Assets to be Disposed of by Method Other than Sale, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs						$ 12