Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Line Items]
Cash and Cash Equivalents	$ 2,675	$ 1,724		$ 2,675	$ 1,724	$ 1,734
Restricted Cash and Cash Equivalents in Other current assets	167	245		167	245	208
Restricted Cash Equivalents in Other long-term assets	57	46		57	46	52
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	2,898	2,016		2,898	2,016	1,995	$ 607
Other Current Assets [Abstract]
Restricted Cash and Cash Equivalents in Other current assets	167	245		167	245	208
Derivative Asset, Current	167			167		133
Licensing arrangements	145			145		148
Other Assets, Miscellaneous, Current	299			299		263
Other Assets, Current	777			777		751
Trade accounts receivable, net
Accounts receivable	1,781			1,781		1,637
Less: allowance for doubtful accounts	(107)			(107)		(105)
Trade accounts receivable, net	1,675			1,675		1,531
Allowance for doubtful accounts
Beginning balance	101	87	$ 74	105	74
Accounts Receivable, Change in Method, Credit Loss Expense (Reversal)					10
Charges to expenses	9	14		11	22
Utilization of allowances	(4)	(7)		(10)	(13)
Ending balance	107	94	$ 87	107	94
Inventories
Inventory, Finished Goods, Net of Reserves	933			933		893
Inventory, Work in Process, Net of Reserves	121			121		109
Inventory, Raw Materials, Net of Reserves	376			376		349
Inventories	1,430			1,430		1,351
Property, plant and equipment, net
Land	104			104		104
Buildings and improvements	1,342			1,342		1,292
Equipment, furniture and fixtures	3,517			3,517		3,465
Capital in progress	432			432		446
Property, plant and equipment	5,395			5,395		5,308
Less: accumulated depreciation	3,313			3,313		3,224
Property, plant and equipment, net	2,082			2,082		2,084
Supplemental Balance Sheet Information
Depreciation expense	83	78		166	154
Other Assets, Noncurrent [Abstract]
Restricted cash equivalents included in Other long-term assets	57	$ 46		57	$ 46	52
Operating Lease, Right-of-Use Asset	411			411		458
Derivative Asset	156			156		109
Investments	616			616		918
Licensing arrangements, asset	166			166		218
Other, Other Long-term Assets	224			224		166
Other Assets, Noncurrent	1,629			1,629		1,921
Accrued expenses
Legal reserves, current	417			417		505
Payroll and related liabilities	801			801		681
Accrued Rebates, Current	354			354		331
Business Combination, Contingent Consideration, Liability, Current	258			258		26
Other	612			612		656
Accrued Liabilities, Current	2,442			2,442		2,197
Other Liabilities, Current [Abstract]
Deferred Revenue, Current	141			141		138
Accrued Royalties, Current	151			151		153
Taxes Payable, Current	121			121		158
Disposal Group, Including Discontinued Operation, Liabilities, Current	0			0		200
Other Sundry Liabilities, Current	268			268		307
Other Liabilities, Current	680			680		958
Other long-term liabilities
Accrued income taxes	535			535		547
Estimated Litigation Liability, Noncurrent	200			200		64
Business Combination, Contingent Consideration, Liability, Noncurrent	54			54		171
Licensing arrangements, liability	199			199		253
Operating Lease, Liability, Noncurrent	359			359		401
Deferred Revenue	283			283		257
Other Accrued Liabilities, Noncurrent	560			560		615
Other long-term liabilities	$ 2,190			$ 2,190		$ 2,309