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2018 Global Restructuring Program Narrative (Details) - 2018 Global Restructuring Program $ in Millions	3 Months Ended		9 Months Ended		33 Months Ended	48 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2021 USD ($) Employee	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Restructuring Cost and Reserve
Restructuring Reserve	$ 114	$ 142	$ 114	$ 142	$ 114		$ 132	$ 210
Payments for Restructuring			(177)	(230)
Before Tax
Restructuring Cost and Reserve
Restructuring Charges	157	(56)	337	215	1,700
After Tax
Restructuring Cost and Reserve
Restructuring Charges	107	(33)	254	180	1,300
Accrued Expenses
Restructuring Cost and Reserve
Restructuring Reserve	80	84	80	84	80
Other current liabilities
Restructuring Cost and Reserve
Restructuring Reserve	$ 34	$ 58	$ 34	$ 58	$ 34
Minimum \| Scenario, Forecast
Restructuring Cost and Reserve
Expected Number of Positions Eliminated \| Employee						5,000
Minimum \| Before Tax \| Scenario, Forecast
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost						$ 1,700
Minimum \| After Tax \| Scenario, Forecast
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost						1,300
Minimum \| Cash charges \| Scenario, Forecast
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost						900
Minimum \| Non-cash charges \| Before Tax \| Scenario, Forecast
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost						$ 800
Maximum \| Scenario, Forecast
Restructuring Cost and Reserve
Expected Number of Positions Eliminated \| Employee						5,500
Maximum \| Before Tax \| Scenario, Forecast
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost						$ 1,900
Maximum \| After Tax \| Scenario, Forecast
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost						1,400
Maximum \| Cash charges \| Scenario, Forecast
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost						1,000
Maximum \| Non-cash charges \| Before Tax \| Scenario, Forecast
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost						$ 900