Earnings Per Share 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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income/(loss) from continuing operations attributable to Caesars, net of income taxes									$ 303	$ (368)	$ (6,429)
Income from discontinued operations attributable to Caesars, net of income taxes									0	0	3,380
Net income/(loss) attributable to Caesars	$ 198	$ 110	$ 29	$ (34)	$ 2,004	$ (433)	$ (1,432)	$ (507)	303	(368)	(3,049)
Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities									42	0	0
Adjusted net income/(loss) attributable to Caesars									$ 345	$ (368)	$ (3,049)
Weighted-average common shares outstanding - basic									686	279	146
Weighted-average common shares outstanding - diluted									841	279	146
Basic earnings/(loss) per share from continuing operations									$ 0.44	$ (1.32)	$ (43.96)
Basic earnings per share from discontinued operations									0	0	23.11
Basic earnings/(loss) per share	$ 0.29	$ 0.16	$ 0.04	$ (0.05)	$ 3.01	$ (2.90)	$ (9.62)	$ (3.44)	0.44	(1.32)	(20.85)
Diluted earnings/(loss) per share from continuing operations									0.41	(1.32)	(43.96)
Diluted earnings per share from discontinued operations									0	0	23.11
Diluted earnings/(loss) per share	$ 0.25	$ 0.14	$ 0.04	$ (0.05)	$ 2.48	$ (2.90)	$ (9.62)	$ (3.44)	$ 0.41	$ (1.32)	$ (20.85)
Stock-based compensation awards
Dilutive potential common shares									4	0	0
CEC Convertible Notes
Dilutive potential common shares									151	0	0