CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Millions		Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Net Former Parent Investment	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 29, 2018			0
Beginning balance at Dec. 29, 2018		$ 1,494	$ 0	$ 0	$ 0	$ 1,576	$ (82)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to Covetrus	[1]	(23)			(33)	10
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	608		(609)
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 held in escrow expected to be canceled		(30)		(30)
Net Increase (Decrease) In Parent Investment		176				176
Issuance of shares in connection with share-based compensation plans (in shares)			496,976
Issuance of shares in connection with share-based compensation plans		2		2
Share-based compensation		25		25
Dividends declared on Series A Preferred Stock		0
Other comprehensive income (loss)		5					5
Ending balance (in shares) at Jun. 30, 2019			111,932,491
Ending balance at Jun. 30, 2019		2,247	$ 1	2,356	(33)	0	(77)
Beginning balance (in shares) at Mar. 31, 2019			111,576,343
Beginning balance at Mar. 31, 2019		2,294	$ 1	2,395	(21)	0	(81)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to Covetrus	[1]	(10)			(12)	2
Dividend to Former Parent		(21)		(21)		0
Shares held in escrow expected to be canceled		(30)		(30)
Net Increase (Decrease) In Parent Investment		(2)				(2)
Issuance of shares in connection with share-based compensation plans (in shares)			356,148
Issuance of shares in connection with share-based compensation plans		2		2
Share-based compensation		10		10
Dividends declared on Series A Preferred Stock		0
Other comprehensive income (loss)		4					4
Ending balance (in shares) at Jun. 30, 2019			111,932,491
Ending balance at Jun. 30, 2019		$ 2,247	$ 1	2,356	(33)	$ 0	(77)
Beginning balance (in shares) at Dec. 31, 2019		111,620,507	111,620,507
Beginning balance at Dec. 31, 2019		$ 1,256	$ 1	2,381	(1,040)		(86)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to Covetrus	[1]	20			20
Issuance of shares in connection with share-based compensation plans (in shares)			1,054,150
Issuance of shares in connection with share-based compensation plans		4		4
Share-based compensation		19		19
Dividends declared on Series A Preferred Stock		(2)			(2)
Other comprehensive income (loss)		$ (21)					(21)
Ending balance (in shares) at Jun. 30, 2020		112,674,657	112,674,657
Ending balance at Jun. 30, 2020		$ 1,276	$ 1	2,404	(1,022)		(107)
Beginning balance (in shares) at Mar. 31, 2020			111,854,439
Beginning balance at Mar. 31, 2020		1,201	$ 1	2,390	(1,074)		(116)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to Covetrus	[1]	54			54
Dividend to Former Parent		(2)
Issuance of shares in connection with share-based compensation plans (in shares)			820,218
Issuance of shares in connection with share-based compensation plans		4		4
Share-based compensation		10		10
Dividends declared on Series A Preferred Stock		(2)			(2)
Other comprehensive income (loss)		$ 9					9
Ending balance (in shares) at Jun. 30, 2020		112,674,657	112,674,657
Ending balance at Jun. 30, 2020		$ 1,276	$ 1	$ 2,404	$ (1,022)		$ (107)

[1] (a) Net income earned from January 1, 2019 through February 7, 2019 is attributed to the Former Parent as it was the sole shareholder prior to February 7, 2019.