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2018 Global Restructuring Program Narrative (Details) - 2018 Global Restructuring Program $ in Millions	3 Months Ended		9 Months Ended		21 Months Ended	36 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2020 USD ($) Employee	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Restructuring Cost and Reserve
Restructuring Reserve	$ 142	$ 263	$ 142	$ 263	$ 142			$ 210	$ 0
Payments for Restructuring			(230)	(229)
Before Tax
Restructuring Cost and Reserve
Restructuring Charges	(56)	149	215	856	1,300
After Tax
Restructuring Cost and Reserve
Restructuring Charges	(33)	119	180	659	1,000
Accrued Expenses
Restructuring Cost and Reserve
Restructuring Reserve	84	138	84	138	84
Other current liabilities
Restructuring Cost and Reserve
Restructuring Reserve	$ 58	$ 125	58	$ 125	$ 58
Sale of manufacturing facility and associated real estate [Member] \| Before Tax
Restructuring Cost and Reserve
Restructuring Charges			$ 182
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	$ 375
Minimum \| After Tax \| Scenario, Forecast
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost						1,350	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	425
Maximum \| After Tax \| Scenario, Forecast
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost						1,500	$ 345
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