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2018 Global Restructuring Program Restructuring Reserve (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		42 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021
Restructuring Cost and Reserve
Nonoperating expense	$ (55)	$ (6)	$ (61)	$ (17)
2018 Global Restructuring Program
Restructuring Cost and Reserve
Restructuring liabilities - January 1			93	132
Cash payments			(98)	(122)
Currency and other			0	(3)
2018 Global Restructuring Program \| Before Tax
Restructuring Cost and Reserve
Charges for workforce reductions and other cash exit costs	119	87	153	180	$ 2,000
2018 Global Restructuring Program \| Before Tax \| Nonoperating expense
Restructuring Cost and Reserve
Nonoperating expense	$ 56	$ 0	56	0
2018 Global Restructuring Program \| Workforce reductions and other exit costs
Restructuring Cost and Reserve
Charges for workforce reductions and other cash exit costs			$ 77	$ 99