Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to items of consideration transferred in connection with a business combination for which the initial accounting was incomplete.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Number of shares that have been repurchased and retired during the period.

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Business Acquisitions - Vets First Choice Narrative (Details) - Vets First Choice - USD ($) $ in Millions	3 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2019	Feb. 07, 2019
Business Acquisition [Line Items]
Reduction to purchase price			$ 30
Shares canceled (in shares)			700,400
Intangible assets				$ 545
Weighted-average amortization period			7 years
Revenue		$ 246
Net loss		$ (525)
Goodwill adjustment	$ 4		$ 34
Trademarks and Trade Names
Business Acquisition [Line Items]
Intangible assets				20
Product Formulas
Business Acquisition [Line Items]
Intangible assets				50
Customer relationships
Business Acquisition [Line Items]
Intangible assets				125
Developed Technology Rights
Business Acquisition [Line Items]
Intangible assets				$ 350