Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Line Items]
Cash and Cash Equivalents	$ 370	$ 139	$ 217
Restricted Cash and Cash Equivalents in Other current assets	288	2,724	346
Restricted Cash Equivalents in Other long-term assets	42	33	43
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	700	2,896	607	$ 829
Other Current Assets [Abstract]
Restricted Cash and Cash Equivalents, Current	288	2,724	346
Derivative Asset, Current	218		105
Licensing arrangements	182		186
Income Taxes Receivable, Current	125		105
Other Assets, Miscellaneous, Current	231		138
Other Assets, Current	1,043		880
Trade accounts receivable, net
Accounts receivable	1,664		1,902
Less: allowance for doubtful accounts	(87)		(74)
Trade accounts receivable, net	1,577		1,828
Allowance for doubtful accounts
Beginning balance	74	68
Accounts Receivable, Change in Method, Credit Loss Expense (Reversal)	10
Charges to expenses	9	7
Utilization of allowances	(6)	(2)
Ending balance	87	72
Inventories
Inventory, Finished Goods, Net of Reserves	991		971
Inventory, Work in Process, Net of Reserves	184		192
Inventory, Raw Materials, Net of Reserves	453		416
Inventories	1,628		1,579
Property, plant and equipment, net
Land	116		117
Buildings and improvements	1,199		1,198
Equipment, furniture and fixtures	3,437		3,411
Capital in progress	450		442
Property, plant and equipment	5,203		5,169
Less: accumulated depreciation	3,104		3,089
Property, plant and equipment, net	2,098		2,079
Supplemental Balance Sheet Information
Depreciation expense	76	69
Other Assets, Noncurrent [Abstract]
Restricted Cash Equivalents, Noncurrent	42	$ 33	43
Operating Lease, Right-of-Use Asset	327		336
Derivative Asset	292		216
Investments	437		458
Licensing arrangements, asset	298		332
Other, Other Long-term Assets	143		144
Other Assets, Noncurrent	1,538		1,529
Accrued expenses
Legal reserves, current	211		470
Payroll and related liabilities	569		708
Accrued Rebates, Current	271		298
Business Combination, Contingent Consideration, Liability, Current	20		56
Other	490		576
Accrued Liabilities, Current	1,562		2,109
Other Liabilities, Current [Abstract]
Deferred Revenue, Current	141		144
Accrued Royalties, Current	186		197
Taxes Payable, Current	246		265
Other Sundry Liabilities, Current	231		195
Other Liabilities, Current	804		800
Other long-term liabilities
Accrued income taxes	662		667
Estimated Litigation Liability, Noncurrent	201		227
Business Combination, Contingent Consideration, Liability, Noncurrent	197		299
Licensing arrangements, liability	321		374
Operating Lease, Liability, Noncurrent	269		276
Deferred Revenue	251		257
Other Accrued Liabilities, Noncurrent	510		535
Other long-term liabilities	$ 2,412		$ 2,635