Business Acquisitions - Consideration Transferred Vets First Choice (Details) - VFC $ / shares in Units, $ in Millions	Feb. 07, 2019 USD ($) $ / shares shares
Business Acquisition [Line Items]
Total Covetrus shares issued to VFC shareholders (in shares) | shares	39,041,070
Per share price (in actuals) | $ / shares	$ 43.05
Total fair value of shares issued to Vets First Choice shareholders	$ 1,681
Fair value of Vets First Choice replacement stock option awards attributable to pre-acquisition service	62
Vets First Choice debt repaid at close	24
Vets First Choice expenses paid at close	18
Less: Vets First Choice cash used to fund transaction	(9)
Total consideration	$ 1,776