Business Combinations, Strategic Investment, Number of Veterinary Management Groups

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Business Acquisitions - Narrative (Details) $ in Millions	12 Months Ended
Business Acquisitions - Narrative (Details) $ in Millions	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Oct. 07, 2020 managementGroup	Dec. 31, 2019 USD ($)
Business Acquisition [Line Items]
Goodwill	$ 1,247	$ 1,187		$ 1,154
VCP and AppointMaster
Business Acquisition [Line Items]
Consideration transferred	85
Goodwill	60
Finite-lived intangibles acquired	$ 31
Interest acquired in Veterinary Study Groups, Inc	100.00%
VCP and AppointMaster \| Common Stock
Business Acquisition [Line Items]
Common stock issued in acquisition, amount	$ 4
Veterinary Study Groups, Inc.
Business Acquisition [Line Items]
Interest acquired in Veterinary Study Groups, Inc			80.00%
Number of veterinary management groups acquired \| managementGroup			50