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2018 Global Restructuring Program Narrative (Details) - 2018 Global Restructuring Program $ in Millions	3 Months Ended		39 Months Ended	48 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) Employee	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Restructuring Cost and Reserve
Restructuring Reserve	$ 65	$ 111	$ 65		$ 93	$ 132
Payments for Restructuring	(50)	(64)
Before Tax
Restructuring Cost and Reserve
Restructuring Charges	34	93	1,900
After Tax
Restructuring Cost and Reserve
Restructuring Charges	27	75	1,400
Accrued Expenses
Restructuring Cost and Reserve
Restructuring Reserve	50	77	50
Other current liabilities
Restructuring Cost and Reserve
Restructuring Reserve	$ 15	$ 34	$ 15
Minimum \| Scenario, Forecast
Restructuring Cost and Reserve
Expected Number of Positions Eliminated \| Employee				6,300
Minimum \| Before Tax \| Scenario, Forecast
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost				$ 2,000
Restructuring and Related Cost, Expected Cost Remaining				180
Minimum \| After Tax \| Scenario, Forecast
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost				1,500
Restructuring and Related Cost, Expected Cost Remaining				135
Minimum \| Cash charges \| Scenario, Forecast
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost				1,100
Minimum \| Non-cash charges \| Before Tax \| Scenario, Forecast
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost				$ 900
Maximum \| Scenario, Forecast
Restructuring Cost and Reserve
Expected Number of Positions Eliminated \| Employee				6,400
Maximum \| Before Tax \| Scenario, Forecast
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost				$ 2,100
Restructuring and Related Cost, Expected Cost Remaining				280
Maximum \| After Tax \| Scenario, Forecast
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost				1,600
Restructuring and Related Cost, Expected Cost Remaining				215
Maximum \| Cash charges \| Scenario, Forecast
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost				1,150
Maximum \| Non-cash charges \| Before Tax \| Scenario, Forecast
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost				$ 950