Held for Sale (Details) - USD ($) $ in Millions	Jun. 30, 2020	Apr. 01, 2020	Mar. 31, 2020	Jan. 31, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current liabilities			$ 20		$ 21
scil Animal Care Business | Disposal Group, Held-for-sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase price				$ 125
Current assets			23		24
Property and equipment, net			16		15
Goodwill			2		2
Other intangibles, net			4		4
Investments and other			3		3
Assets held for sale			48		48
Current liabilities			17		18
Other non-current liabilities			3		3
Liabilities held for sale			$ 20		$ 21
scil Animal Care Business | Subsequent Event | Disposal Group, Held-for-sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase price		$ 110
Disposal Group, Including Discontinued Operation, Consideration, Net of Dealer Related Fees and other Transactions		100
Collateral Pledged | scil Animal Care Business | Subsequent Event | Disposal Group, Held-for-sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase price		$ 10
Forecast
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Building held-for-sale	$ 74