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2018 Global Restructuring Program Narrative (Details) - 2018 Global Restructuring Program $ in Millions	3 Months Ended		6 Months Ended		42 Months Ended	48 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) Employee	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Restructuring Cost and Reserve
Restructuring Reserve	$ 72	$ 106	$ 72	$ 106	$ 72		$ 93	$ 132
Payments for Restructuring			(98)	(122)
Before Tax
Restructuring Cost and Reserve
Restructuring Charges	119	87	153	180	2,000
After Tax
Restructuring Cost and Reserve
Restructuring Charges	94	72	121	147	1,500
Accrued Expenses
Restructuring Cost and Reserve
Restructuring Reserve	57	75	57	75	57
Other current liabilities
Restructuring Cost and Reserve
Restructuring Reserve	$ 15	$ 31	$ 15	$ 31	$ 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