Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Line Items]
Cash and Cash Equivalents	$ 1,947	$ 2,022	$ 1,947	$ 2,022	$ 1,734
Restricted Cash and Cash Equivalents in Other current assets	155	214	155	214	208
Restricted Cash Equivalents in Other long-term assets	57	46	57	46	52
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	2,159	2,282	2,159	2,282	1,995	$ 607
Other Current Assets [Abstract]
Restricted Cash and Cash Equivalents in Other current assets	155	214	155	214	208
Derivative Asset, Current	192		192		133
Licensing arrangements	142		142		148
Other Assets, Miscellaneous, Current	302		302		263
Other Assets, Current	792		792		751
Trade accounts receivable, net
Accounts receivable	1,778		1,778		1,637
Less: allowance for doubtful accounts	(108)		(108)		(105)
Trade accounts receivable, net	1,669		1,669		1,531
Allowance for doubtful accounts
Beginning balance	107	94	105	74
Accounts Receivable, Change in Method, Credit Loss Expense (Reversal)				10
Charges to expenses	9	16	20	39
Utilization of allowances	(7)	(7)	(17)	(19)
Ending balance	108	103	108	103
Inventories
Inventory, Finished Goods, Net of Reserves	1,039		1,039		893
Inventory, Work in Process, Net of Reserves	127		127		109
Inventory, Raw Materials, Net of Reserves	436		436		349
Inventories	1,603		1,603		1,351
Property, plant and equipment, net
Land	103		103		104
Buildings and improvements	1,340		1,340		1,292
Equipment, furniture and fixtures	3,515		3,515		3,465
Capital in progress	465		465		446
Property, plant and equipment	5,423		5,423		5,308
Less: accumulated depreciation	3,314		3,314		3,224
Property, plant and equipment, net	2,109		2,109		2,084
Supplemental Balance Sheet Information
Depreciation expense	88	84	254	238
Other Assets, Noncurrent [Abstract]
Restricted cash equivalents included in Other long-term assets	57	$ 46	57	$ 46	52
Operating Lease, Right-of-Use Asset	415		415		458
Derivative Asset	176		176		109
Investments	434		434		918
Licensing arrangements, asset	138		138		218
Other, Other Long-term Assets	223		223		166
Other Assets, Noncurrent	1,444		1,444		1,921
Accrued expenses
Legal reserves, current	357		357		505
Payroll and related liabilities	884		884		681
Accrued Rebates, Current	351		351		331
Business Combination, Contingent Consideration, Liability, Current	253		253		26
Other	574		574		656
Accrued Liabilities, Current	2,418		2,418		2,197
Other Liabilities, Current [Abstract]
Deferred Revenue, Current	160		160		138
Accrued Royalties, Current	142		142		153
Taxes Payable, Current	113		113		158
Disposal Group, Including Discontinued Operation, Liabilities, Current	0		0		200
Other Sundry Liabilities, Current	255		255		307
Other Liabilities, Current	669		669		958
Other long-term liabilities
Accrued income taxes	541		541		547
Estimated Litigation Liability, Noncurrent	191		191		64
Business Combination, Contingent Consideration, Liability, Noncurrent	195		195		171
Licensing arrangements, liability	155		155		253
Operating Lease, Liability, Noncurrent	377		377		401
Deferred Revenue	296		296		257
Other Accrued Liabilities, Noncurrent	542		542		615
Other long-term liabilities	$ 2,296		$ 2,296		$ 2,309