Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for doubtful accounts
Beginning balance	$ 119	$ 105	$ 112
Net (credits) charges to expenses		15	10
Utilization of allowances	(11)	(16)	(15)
Ending balance	119	119	105
Trade accounts receivable, net
Accounts receivable	1,591	1,394
Less: allowance for doubtful accounts	(73)	(75)
Less: allowance for sales returns	(46)	(44)
Trade accounts receivable, net	1,472	1,275
Property, plant and equipment, net
Land	91	86
Buildings and improvements	981	981
Equipment, furniture and fixtures	2,955	2,793
Capital in progress	338	202
Property, plant and equipment	4,365	4,062
Less: accumulated depreciation	2,735	2,572
Property, plant and equipment, net	1,630	1,490	1,507
Accrued expenses
Legal reserves	1,062	773
Payroll and related liabilities	572	504
Accrued contingent consideration	63	119
Other	615	574
Accrued expenses	2,312	1,970
Other long-term liabilities
Accrued income taxes	781	1,253
Legal reserves	961	1,163
Accrued contingent consideration	141	127
Other long-term liabilities	455	431
Other long-term liabilities	2,338	2,974
Allowance for Doubtful Accounts [Member]
Allowance for doubtful accounts
Beginning balance	75	76	81
Net (credits) charges to expenses	9	15	10
Utilization of allowances		(16)	(15)
Ending balance	$ 73	$ 75	$ 76