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2018 Global Restructuring Program Narrative (Details) - 2018 Global Restructuring Program $ in Millions	3 Months Ended		27 Months Ended	48 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2021 Employee	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Restructuring Cost and Reserve
Restructuring Reserve	$ 111	$ 219	$ 111			$ 132	$ 210
Payments for Restructuring	(64)	(71)
Before Tax
Restructuring Cost and Reserve
Restructuring Charges	93	152	1,500
After Tax
Restructuring Cost and Reserve
Restructuring Charges	75	121	1,100
Accrued Expenses
Restructuring Cost and Reserve
Restructuring Reserve	77	132	77
Other current liabilities
Restructuring Cost and Reserve
Restructuring Reserve	$ 34	$ 87	$ 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