Restructuring Actions - Roll Forward (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2020
2020 Restructuring Actions | COVID-19 Pandemic
Restructuring Reserve Roll Forward
Expenses incurred		$ 58
Non-cash changes	$ (23)
Restructuring Reserve, Accrual Adjustment	(9)
Restructuring actions balances, Ending Balance	26		$ 26
Employee-Related | 2020 Restructuring Actions | COVID-19 Pandemic
Restructuring Reserve Roll Forward
Expenses incurred		35
Restructuring Reserve, Accrual Adjustment	(9)
Restructuring actions balances, Ending Balance	26		26
Employee-Related | 2019 Restructuring Actions
Restructuring Reserve Roll Forward
Restructuring actions balances, Beginning Balance			140
Cash Payments			(25)
Restructuring Reserve, Accrual Adjustment			(55)
Restructuring actions balances, Ending Balance	60		60
Asset-Related | 2020 Restructuring Actions | COVID-19 Pandemic
Restructuring Reserve Roll Forward
Expenses incurred		23
Non-cash changes	(23)
Drug delivery business | 2020 Restructuring Actions
Restructuring Reserve Roll Forward
Expenses incurred		55
Non-cash changes	(14)
Cash Payments	(7)
Restructuring actions balances, Ending Balance	34		34
Drug delivery business | Employee-Related | 2020 Restructuring Actions
Restructuring Reserve Roll Forward
Expenses incurred		32
Cash Payments	(7)
Restructuring actions balances, Ending Balance	25		25
Drug delivery business | Asset-Related and Other | 2020 Restructuring Actions
Restructuring Reserve Roll Forward
Expenses incurred		$ 23
Non-cash changes	(14)
Restructuring actions balances, Ending Balance	$ 9		$ 9