Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Line Items]
Cash and Cash Equivalents	$ 1,724		$ 123	$ 1,724	$ 123	$ 217
Restricted Cash and Cash Equivalents in Other current assets	245		2,657	245	2,657	346
Restricted Cash Equivalents in Other long-term assets	46		42	46	42	43
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	2,016		2,823	2,016	2,823	607	$ 829
Other Current Assets [Abstract]
Restricted Cash and Cash Equivalents in Other current assets	245		2,657	245	2,657	346
Derivative Asset, Current	161			161		105
Licensing arrangements	167			167		186
Other Assets, Miscellaneous, Current	351			351		243
Other Assets, Current	925			925		880
Trade accounts receivable, net
Accounts receivable	1,551			1,551		1,902
Less: allowance for doubtful accounts	(94)			(94)		(74)
Trade accounts receivable, net	1,457			1,457		1,828
Allowance for doubtful accounts
Beginning balance	87	$ 74	72	74	68
Accounts Receivable, Change in Method, Credit Loss Expense (Reversal)				10
Charges to expenses	14		4	22	11
Utilization of allowances	(7)		(4)	(13)	(6)
Ending balance	94	$ 87	73	94	73
Inventories
Inventory, Finished Goods, Net of Reserves	867			867		971
Inventory, Work in Process, Net of Reserves	166			166		192
Inventory, Raw Materials, Net of Reserves	482			482		416
Inventories	1,516			1,516		1,579
Property, plant and equipment, net
Land	118			118		117
Buildings and improvements	1,229			1,229		1,198
Equipment, furniture and fixtures	3,449			3,449		3,411
Capital in progress	405			405		442
Property, plant and equipment	5,201			5,201		5,169
Less: accumulated depreciation	3,122			3,122		3,089
Property, plant and equipment, net	2,079			2,079		2,079
Supplemental Balance Sheet Information
Depreciation expense	78		73	154	142
Other Assets, Noncurrent [Abstract]
Restricted cash equivalents included in Other long-term assets	46		$ 42	46	$ 42	43
Operating Lease, Right-of-Use Asset	315			315		336
Derivative Asset	241			241		216
Investments	467			467		458
Licensing arrangements, asset	273			273		332
Other, Other Long-term Assets	157			157		144
Other Assets, Noncurrent	1,500			1,500		1,529
Accrued expenses
Legal reserves, current	314			314		470
Payroll and related liabilities	572			572		708
Accrued Rebates, Current	269			269		298
Business Combination, Contingent Consideration, Liability, Current	32			32		56
Other	531			531		576
Accrued Liabilities, Current	1,718			1,718		2,109
Other Liabilities, Current [Abstract]
Deferred Revenue, Current	143			143		144
Accrued Royalties, Current	174			174		197
Taxes Payable, Current	193			193		265
Other Sundry Liabilities, Current	219			219		195
Other Liabilities, Current	729			729		800
Other long-term liabilities
Accrued income taxes	640			640		667
Estimated Litigation Liability, Noncurrent	54			54		227
Business Combination, Contingent Consideration, Liability, Noncurrent	176			176		299
Licensing arrangements, liability	314			314		374
Operating Lease, Liability, Noncurrent	263			263		276
Deferred Revenue	251			251		257
Other Accrued Liabilities, Noncurrent	537			537		535
Other long-term liabilities	$ 2,236			$ 2,236		$ 2,635