Litigation, Contractual Commitments, and Contingent Liabilities - Exit Costs Accrual Composition (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Exit cost accruals	$ 63	$ 66
Unbundling of electric service provided by NV Energy
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Exit cost accruals	46	49
Caesars Entertainment Operating Company | Discontinued operations, disposed of by means other than sale, abandonment | Iowa greyhound pari-mutuel racing fund
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Exit cost accruals	$ 17	$ 17