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Business Acquisitions - Summary of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Feb. 07, 2019
Dec. 29, 2018
Dec. 30, 2017
Business Acquisition [Line Items]        
Goodwill $ 1,154   $ 750 $ 760
Vets First Choice        
Business Acquisition [Line Items]        
Fair value of net assets acquired   $ 14    
Goodwill   1,324    
Intangible assets   545    
Deferred tax liabilities   (107)    
Total acquisition cost   $ 1,776