Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts Receivable, Net [Abstract]
Trade accounts receivable, net	$ 1,828	$ 1,608
Accounts receivable	1,902	1,676
Allowance for doubtful accounts	(74)	(68)
Beginning balance	68	98	$ 119
Net (credits) charges to expenses	23	19	14
Utilization of allowances	(17)	(19)	(18)
Ending balance	74	68	98
Inventory, Net [Abstract]
Finished goods	971	760
Work-in-process	192	100
Raw materials	416	306
Inventory, Net	1,579	1,166
Other Current Assets [Abstract]
Restricted Cash and Cash Equivalents, Current	346	655	803
Derivative Asset, Current	105	122
Licensing arrangements, asset	332	0
Income Taxes Receivable, Current	105	37
Other Assets, Miscellaneous, Current	138	107
Other Assets, Current	880	921
Property, Plant and Equipment [Abstract]
Land	117	97
Buildings and improvements	1,198	1,100
Equipment, furniture and fixtures	3,411	3,224
Capital in progress	442	319
Property, plant and equipment	5,169	4,740
Less: accumulated depreciation	3,089	2,958
Property, plant and equipment, net	2,079	1,782	1,697
Depreciation	311	296	279
Other Assets, Noncurrent [Abstract]
Restricted Cash, Noncurrent	43	27
Operating Lease, Right-of-Use Asset	336	0	0
Derivative Asset	216	183
Investments	458	424
Other Assets, Noncurrent	1,529	845
Licensing arrangements	186	0
Accrued Liabilities, Current [Abstract]
Legal reserves	470	712
Payroll and related liabilities	708	630
Accrued contingent consideration	56	138
Accrued Rebates, Current	298	229
Other Accrued Liabilities, Current	576	538
Accrued expenses	2,109	2,246
Other Liabilities, Current [Abstract]
Deferred Revenue, Current	144	115
Licensing arrangements, liability	197	0
Taxes Payable, Current	265	125
Other Sundry Liabilities, Current	195	173
Other Liabilities, Current	800	412
Other Liabilities, Noncurrent [Abstract]
Accrued income taxes	667	739
Legal reserves	227	217
Accrued contingent consideration	299	209
Other Liabilities	374	0
Operating Lease, Liability, Noncurrent	276	0
Other	792	717
Other long-term liabilities	2,635	1,882
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Accounts Receivable, Net [Abstract]
Beginning balance	68	68	73
Net (credits) charges to expenses		19	14
Utilization of allowances		(19)	(18)
Ending balance	74	68	$ 68
Other Assets [Member]
Other Assets, Noncurrent [Abstract]
Other Assets, Miscellaneous, Noncurrent	$ 144	$ 211