Description of Business and Basis of Presentation (Details) $ in Millions	1 Months Ended
	Jan. 31, 2020 USD ($) market	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other receivables		$ 60	$ 91
Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other receivables	$ 20
Number of smaller markets sold | market	6