Assets and Liabilities Held for Sale (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018	Jul. 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]	$ 2,009		$ 2,009			$ 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]	56		56			46
Assets held for sale		9,877		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		53		53			32
Trade accounts receivable, less allowance for doubtful accounts		555		555			532
Inventories		580		580			538
Other current assets		56		56			56
PP&E		714		714			675
Identifiable intangible assets, less accumulated amortization		5,753		5,753			5,763
Goodwill		1,965		1,965			1,972
Noncurrent deferred tax assets and other noncurrent tax assets		55		55			54
Other noncurrent assets		91		91			57
Assets held for sale		9,821		9,821			9,678
Trade accounts payable		348		348			406
Income taxes payable		63		63			39
Accrued compensation and related items		79		79			93
Other current liabilities		334		334			353
Pension benefit obligations, net		41		41			39
Postretirement benefit obligations, net		34		34			33
Noncurrent deferred tax liabilities		1,036		1,036			870
Other noncurrent liabilities		74		74			56
Total Consumer Healthcare liabilities held for sale		2,009		2,009			$ 1,890
Pre-tax income on a management business unit basis		$ 274	$ 249	$ 554	$ 514
Subsequent Event [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%
Subsequent Event [Member] | GSK [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.