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2018 Global Restructuring Program Restructuring Reserve (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		45 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021
Restructuring Cost and Reserve
Nonoperating expense	$ (10)	$ (40)	$ (71)	$ (57)
2018 Global Restructuring Program
Restructuring Cost and Reserve
Restructuring liabilities - January 1			94	132
Cash payments			(171)	(177)
Currency and other			(3)	(3)
2018 Global Restructuring Program \| Before Tax
Restructuring Cost and Reserve
Charges for workforce reductions and other cash exit costs	97	157	250	337	$ 2,100
2018 Global Restructuring Program \| Before Tax \| Nonoperating expense
Restructuring Cost and Reserve
Nonoperating expense	$ 9	$ 26	65	26
2018 Global Restructuring Program \| Workforce reductions and other exit costs
Restructuring Cost and Reserve
Charges for workforce reductions and other cash exit costs			$ 145	$ 162