Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Cash and Cash Equivalents, at Carrying Value	$ 208	$ 195	$ 208	$ 195	$ 188
Restricted Cash and Cash Equivalents, Current	756	255	756	255	803
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	994	476	994	476	1,017	$ 487
Trade accounts receivable, net
Accounts receivable	1,650		1,650		1,645
Less: allowance for doubtful accounts	(63)		(63)		(68)
Less: allowance for sales returns	0		0		(30)
Trade accounts receivable, net	1,587		1,587		1,548
Allowance for doubtful accounts
Beginning balance	67	75	68	73
Charges to expenses	4	2	8	5
Utilization of allowances	(8)	(3)	(14)	(4)
Ending balance	63	74	63	74
Inventories
Finished goods	689		689		685
Work-in-process	102		102		110
Raw materials	296		296		284
Inventories	1,087		1,087		1,078
Prepaid Expense and Other Assets, Current
Restricted Cash and Cash Equivalents, Noncurrent	31	27	31	27	26
prepaid and other current assets	1,001		1,001		942
Property, plant and equipment, net
Land	102		102		102
Buildings and improvements	1,124		1,124		1,120
Equipment, furniture and fixtures	3,255		3,255		3,183
Capital in progress	229		229		219
Property, plant and equipment	4,709		4,709		4,625
Less: accumulated depreciation	(2,995)		(2,995)		(2,928)
Property, plant and equipment, net	1,715		1,715		1,697
Supplemental Balance Sheet Information
Depreciation expense	70	$ 65	137	$ 127
Accrued expenses
Legal reserves	1,043		1,043		1,176
Payroll and related liabilities	528		528		591
Business Combination, Contingent Consideration, Liability, Current	52		52		36
Other	644		644		653
Accrued expenses	2,266		2,266		2,456
Other long-term liabilities
Accrued income taxes	781		781		1,275
Legal reserves	221		221		436
Business Combination, Contingent Consideration, Liability, Noncurrent	227		227		133
Other Accrued Liabilities, Noncurrent	716		716		525
Other long-term liabilities	$ 1,945		$ 1,945		$ 2,370