Acquisitions and Divestitures - Acquisitions (Details) - USD ($) $ in Millions	1 Months Ended
	Jan. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 2,530	$ 2,218
PCA Skin and Elta MD
Business Acquisition [Line Items]
Payments to acquire business	$ 730
Other intangible assets	369
Goodwill	397
Trademarks | PCA Skin and Elta MD
Business Acquisition [Line Items]
Other intangible assets	$ 231
Useful life	25 years
Customer Relationships | PCA Skin and Elta MD
Business Acquisition [Line Items]
Other intangible assets	$ 133
Minimum | Customer Relationships | PCA Skin and Elta MD
Business Acquisition [Line Items]
Useful life	12 years
Maximum | Customer Relationships | PCA Skin and Elta MD
Business Acquisition [Line Items]
Useful life	13 years
North America | PCA Skin and Elta MD
Business Acquisition [Line Items]
Goodwill	$ 397
Percent of goodwill deductible for tax purposes	45.00%