Held for Sale (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019	Dec. 29, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current liabilities		$ 21	$ 0
Building held-for-sale		3
Held-for-sale | scil
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets		24
Property and equipment, net		15
Goodwill		2
Other intangibles, net		4
Investments and other		3
Assets held for sale		48
Current liabilities		18
Other non-current liabilities		3
Liabilities held for sale		$ 21
Forecast | Held-for-sale | Subsequent event | scil
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase price	$ 125