Earnings Per Share - Basic and Dilutive Net Earnings Per Share Reconciliation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income/(loss) attributable to Caesars									$ (1,195)	$ 303	$ (368)
Dilutive effect of CEC Convertible Notes, net of tax									0	(510)	0
Adjusted net loss attributable to Caesars									$ (1,195)	$ (207)	$ (368)
Weighted-average common shares outstanding - basic (in shares)									676	686	279
Weighted-average common shares outstanding - diluted (in shares)									676	841	279
Basic earnings/(loss) per share (in dollars per share)	$ (0.45)	$ (0.53)	$ (0.47)	$ (0.32)	$ 0.29	$ 0.16	$ 0.04	$ (0.05)	$ (1.77)	$ 0.44	$ (1.32)
Diluted earnings/(loss) per share (in dollars per share)	$ (0.45)	$ (0.53)	$ (0.47)	$ (0.32)	$ (0.15)	$ 0.05	$ 0.02	$ (0.05)	$ (1.77)	$ (0.25)	$ (1.32)
Stock-based compensation awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive potential common shares (in shares)									0	4	0
CEC Convertible Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive effect of CEC Convertible Notes, net of tax										$ 42
Dilutive potential common shares (in shares)									0	151	0
Mark-to-Market Adjustment
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive effect of CEC Convertible Notes, net of tax										$ 552
Diluted earnings/(loss) per share (in dollars per share)										$ 0.66
Restatement Adjustment
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Diluted earnings/(loss) per share (in dollars per share)										$ 0.41