Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Line Items]
Cash and Cash Equivalents	$ 168	$ 210	$ 168	$ 210	$ 188
Restricted Cash and Cash Equivalents in Other current assets	781	453	781	453	803
Restricted Cash Equivalents in Other long-term assets	31	27	31	27	26
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	980	690	980	690	1,017	$ 487
Trade accounts receivable, net
Accounts receivable	1,646		1,646		1,645
Less: allowance for doubtful accounts	(66)		(66)		(68)
Less: allowance for sales returns	0		0		(30)
Trade accounts receivable, net	1,580		1,580		1,548
Allowance for doubtful accounts
Beginning balance	63	74	68	73
Charges to expenses	6	9	15	14
Utilization of allowances	(4)	(2)	(17)	(6)
Ending balance	66	81	66	81
Inventories
Inventory, Finished Goods, Net of Reserves	733		733		685
Inventory, Work in Process, Net of Reserves	103		103		110
Inventory, Raw Materials, Net of Reserves	298		298		284
Inventories	1,134		1,134		1,078
Property, plant and equipment, net
Land	101		101		102
Buildings and improvements	1,108		1,108		1,120
Equipment, furniture and fixtures	3,257		3,257		3,183
Capital in progress	261		261		219
Property, plant and equipment	4,726		4,726		4,625
Less: accumulated depreciation	(2,996)		(2,996)		(2,928)
Property, plant and equipment, net	1,730		1,730		1,697
Supplemental Balance Sheet Information
Depreciation expense	74	$ 71	212	$ 198
Accrued expenses
Legal reserves, current	1,050		1,050		1,176
Payroll and related liabilities	590		590		591
Business Combination, Contingent Consideration, Liability, Current	144		144		36
Other	685		685		653
Accrued expenses	2,469		2,469		2,456
Other long-term liabilities
Accrued income taxes	789		789		1,275
Legal reserves, noncurrent	112		112		436
Business Combination, Contingent Consideration, Liability, Noncurrent	161		161		133
Other Accrued Liabilities, Noncurrent	712		712		525
Other long-term liabilities	$ 1,774		$ 1,774		$ 2,370