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Acquisitions and Divestitures - Narrative (Details) - USD ($)
$ in Millions
 1 Months Ended
Jan. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill   $ 2,483 $ 2,218
PCA Skin and Elta MD      
Business Acquisition [Line Items]      
Payments to acquire business $ 730    
Other intangible assets $ 438    
Useful life 25 years    
Goodwill $ 332    
North America | PCA Skin and Elta MD      
Business Acquisition [Line Items]      
Goodwill $ 332    
Percent of goodwill deductible for tax purposes 40.00%    
Trademarks | PCA Skin and Elta MD      
Business Acquisition [Line Items]      
Other intangible assets $ 292    
Customer Relationships | PCA Skin and Elta MD      
Business Acquisition [Line Items]      
Other intangible assets $ 146    
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