Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for doubtful accounts
Beginning balance	$ 98	$ 119	$ 119
Net (credits) charges to expenses		14	9
Utilization of allowances		(18)	(11)
Ending balance	68	98	119
Trade accounts receivable, net
Accounts receivable	1,676	1,645
Allowance for doubtful accounts	(68)	(68)
Allowance for sales returns (1)	0	(30)
Trade accounts receivable, net	1,608	1,548
Property, plant and equipment, net
Land	97	102
Buildings and improvements	1,100	1,120
Equipment, furniture and fixtures	3,224	3,183
Capital in progress	319	219
Property, plant and equipment	4,740	4,625
Less: accumulated depreciation	2,958	2,928
Property, plant and equipment, net	1,782	1,697	1,630
Depreciation	296	279	270
Accrued expenses
Legal reserves	712	1,176
Payroll and related liabilities	630	591
Accrued contingent consideration	138	36
Other	767	653
Accrued expenses	2,246	2,456
Other long-term liabilities
Accrued income taxes	739	1,275
Legal reserves	217	436
Accrued contingent consideration	209	133
Other	717	525
Other long-term liabilities	1,882	2,370
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Allowance for doubtful accounts
Beginning balance	68	73	75
Net (credits) charges to expenses	19	14	9
Utilization of allowances	(19)	(18)	(11)
Ending balance	$ 68	$ 68	$ 73

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