CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common Stock	Accumulated Other Comprehensive Income (Loss)	Additional Paid-in Capital	Accumulated Deficit	Net Former Parent Investment
Balance at the beginning of the period (in shares) at Dec. 29, 2018		0
Balance at the beginning of the period at Dec. 29, 2018	$ 1,452	$ 0	$ (82)	$ 0	$ 0	$ 1,534
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to Covetrus	(980)				(1,001)	21
Dividend to Former Parent	(1,174)			(21)		(1,153)
Issuance of shares at Separation (including Share Sale investors) (in shares)		71,693,426
Issuance of shares at Separation (including Share Sale investors)	0	$ 1		566		(567)
Issuance of shares in connection with the Acquisition (in shares)		39,742,089
Issuance of shares in connection with the Acquisition	1,772			1,772
Shares canceled (in shares)		(700,400)
Shares canceled	(30)			(30)
Net increase in Former Parent investment	172					172
Issuance of shares in connection with share-based compensation plans (in shares)		885,392
Issuance of shares in connection with share-based compensation plans	5			5
Share-based compensation	46			46
Deferred tax impact of acquisition of non-controlling interest	(7)					(7)
Other	1			1
Series A preferred stock dividend	0
Other comprehensive income (loss)	(4)		(4)
Balance at the end of the period (in shares) at Dec. 31, 2019		111,620,507
Balance at the end of the period at Dec. 31, 2019	1,253	$ 1	(86)	2,339	(1,001)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to Covetrus	(19)				(19)	0
Redeemable non-controlling interest redemption value adjustment	(6)			(6)
Issuance of shares in connection with share-based compensation plans (in shares)		1,793,394
Issuance of shares in connection with share-based compensation plans	10			10
Share-based compensation	40			40
Series A preferred stock dividend	(7)				(7)
Conversion of Preferred Series A Stock to Common Stock (in shares)		22,604,063
Conversion of Series A preferred stock	246			246
Other comprehensive income (loss)	$ 20		20
Balance at the end of the period (in shares) at Dec. 31, 2020	136,017,964	136,017,964
Balance at the end of the period at Dec. 31, 2020	$ 1,537	$ 1	(66)	2,629	(1,027)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to Covetrus	(54)				(54)
Issuance of shares in connection with the Acquisition (in shares)		146,633
Issuance of shares in connection with the Acquisition	4			4
Redeemable non-controlling interest redemption value adjustment	(2)			(2)
Share-based compensation	46			46
Series A preferred stock dividend	0
Issuance of shares in connection with share-based compensation plans, net of shares withheld for taxes (in shares)		1,847,372
Issuance of shares in connection with share-based compensation plans, net of shares withheld for taxes	(7)			(7)
Other comprehensive income (loss)	$ (13)		(13)
Balance at the end of the period (in shares) at Dec. 31, 2021	138,011,969	138,011,969
Balance at the end of the period at Dec. 31, 2021	$ 1,511	$ 1	$ (79)	$ 2,670	$ (1,081)	$ 0