Acquisitions and Divestitures - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Jan. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 2,539	$ 2,218
PCA Skin and Elta MD
Business Acquisition [Line Items]
Payments to acquire business	$ 730
Increase to goodwill		64
Decrease to other intangible assets		69
Decrease to deferred income taxes		$ 5
Other intangible assets	$ 369
Useful life	25 years
Goodwill	$ 396
North America | PCA Skin and Elta MD
Business Acquisition [Line Items]
Goodwill	$ 396
Percent of goodwill deductible for tax purposes	45.00%
Trademarks | PCA Skin and Elta MD
Business Acquisition [Line Items]
Other intangible assets	$ 231
Customer Relationships | PCA Skin and Elta MD
Business Acquisition [Line Items]
Other intangible assets	$ 133
Minimum | PCA Skin and Elta MD
Business Acquisition [Line Items]
Useful life	12 years
Maximum | PCA Skin and Elta MD
Business Acquisition [Line Items]
Useful life	13 years