Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Line Items]
Cash and Cash Equivalents	$ 2,022	$ 277	$ 2,022	$ 277	$ 217
Restricted Cash and Cash Equivalents in Other current assets	214	357	214	357	346
Restricted Cash Equivalents in Other long-term assets	46	43	46	43	43
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	2,282	676	2,282	676	607	$ 829
Other Current Assets [Abstract]
Restricted Cash and Cash Equivalents in Other current assets	214	357	214	357	346
Derivative Asset, Current	146		146		105
Licensing arrangements	149		149		186
Other Assets, Miscellaneous, Current	385		385		243
Other Assets, Current	894		894		880
Trade accounts receivable, net
Accounts receivable	1,701		1,701		1,902
Less: allowance for doubtful accounts	(103)		(103)		(74)
Trade accounts receivable, net	1,598		1,598		1,828
Allowance for doubtful accounts
Beginning balance	94	73	74	68
Accounts Receivable, Change in Method, Credit Loss Expense (Reversal)			10
Charges to expenses	16	8	39	19
Utilization of allowances	(7)	(5)	(19)	(11)
Ending balance	103	75	103	75
Inventories
Inventory, Finished Goods, Net of Reserves	871		871		971
Inventory, Work in Process, Net of Reserves	179		179		192
Inventory, Raw Materials, Net of Reserves	421		421		416
Inventories	1,472		1,472		1,579
Property, plant and equipment, net
Land	120		120		117
Buildings and improvements	1,243		1,243		1,198
Equipment, furniture and fixtures	3,411		3,411		3,411
Capital in progress	402		402		442
Property, plant and equipment	5,176		5,176		5,169
Less: accumulated depreciation	3,112		3,112		3,089
Property, plant and equipment, net	2,064		2,064		2,079
Supplemental Balance Sheet Information
Depreciation expense	84	79	238	220
Other Assets, Noncurrent [Abstract]
Restricted cash equivalents included in Other long-term assets	46	$ 43	46	$ 43	43
Operating Lease, Right-of-Use Asset	311		311		336
Derivative Asset	179		179		216
Investments	567		567		458
Licensing arrangements, asset	246		246		332
Other, Other Long-term Assets	165		165		144
Other Assets, Noncurrent	1,516		1,516		1,529
Accrued expenses
Legal reserves, current	552		552		470
Payroll and related liabilities	728		728		708
Accrued Rebates, Current	324		324		298
Business Combination, Contingent Consideration, Liability, Current	47		47		56
Other	544		544		576
Accrued Liabilities, Current	2,195		2,195		2,109
Other Liabilities, Current [Abstract]
Deferred Revenue, Current	147		147		144
Accrued Royalties, Current	151		151		197
Taxes Payable, Current	37		37		265
Other Sundry Liabilities, Current	310		310		195
Other Liabilities, Current	644		644		800
Other long-term liabilities
Accrued income taxes	571		571		667
Estimated Litigation Liability, Noncurrent	48		48		227
Business Combination, Contingent Consideration, Liability, Noncurrent	167		167		299
Licensing arrangements, liability	262		262		374
Operating Lease, Liability, Noncurrent	256		256		276
Deferred Revenue	258		258		257
Other Accrued Liabilities, Noncurrent	569		569		535
Other long-term liabilities	$ 2,132		$ 2,132		$ 2,635