Assets and Liabilities Held for Sale (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Apr. 01, 2018	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total Consumer Healthcare liabilities held for sale	[1]	$ 1,935			$ 1,890
Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other assets held for sale	[2]	47			46
Assets held for sale		9,877			9,725
Consumer Healthcare [Member] | Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents		61			32
Trade accounts receivable, less allowance for doubtful accounts		550			532
Inventories		563			538
Other current assets		57			56
PP&E		687			675
Identifiable intangible assets, less accumulated amortization		5,776			5,763
Goodwill		1,972			1,972
Noncurrent deferred tax assets and other noncurrent tax assets		59			54
Other noncurrent assets		105			57
Assets held for sale		9,830			9,678
Trade accounts payable		335			406
Income taxes payable		55			39
Accrued compensation and related items		140			93
Other current liabilities		371			353
Pension benefit obligations, net		39			39
Postretirement benefit obligations, net		33			33
Noncurrent deferred tax liabilities		884			870
Other noncurrent liabilities		78			56
Total Consumer Healthcare liabilities held for sale		1,935			$ 1,890
Pre-tax income on a management business unit basis		$ 281	$ 265
Forecast [Member] | GSK Consumer Healthcare [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity method investment, ownership percentage				32.00%
GSK [Member] | Forecast [Member] | GSK Consumer Healthcare [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity method investment, ownership percentage				68.00%

[1] Amounts may not add due to rounding.

[2] Other assets held for sale consist of PP&E.