Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at the beginning of the period	$ 1,537	$ 1,253	$ 1,452
Other comprehensive income (loss) attributable to Covetrus before reclassifications	(18)	13	(5)
Reclassified from Accumulated other comprehensive loss to earnings	5	7	1
Period Change	(13)	20	(4)
Balance at the end of the period	1,511	1,537	1,253
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at the beginning of the period	(66)	(86)	(82)
Balance at the end of the period	(79)	(66)	(86)
Derivative Gain (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at the beginning of the period	(3)	0	0
Other comprehensive income (loss) attributable to Covetrus before reclassifications	(2)	(8)	(1)
Reclassified from Accumulated other comprehensive loss to earnings	5	5	1
Period Change	3	(3)	0
Balance at the end of the period	0	(3)	0
Foreign Currency Translation Gain (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at the beginning of the period	(63)	(86)	(82)
Other comprehensive income (loss) attributable to Covetrus before reclassifications	(16)	21	(4)
Reclassified from Accumulated other comprehensive loss to earnings	0	2	0
Period Change	(16)	23	(4)
Balance at the end of the period	$ (79)	$ (63)	$ (86)