Segment Reporting - Adjusted EBITDA (Details) - USD ($) $ 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
Segment Reporting Information [Line Items]
Net income/(loss) attributable to Caesars	$ (304)	$ (359)	$ (315)	$ (217)	$ 198	$ 110	$ 29	$ (34)	$ (1,195)	$ 303	$ (368)
Net loss attributable to noncontrolling interests									(3)	1	(7)
Income tax benefit									(141)	(121)	(1,995)
Gain on deconsolidation of subsidiary									0	0	(31)
Restructuring and support expenses											2,028
Loss on extinguishment of debt									0	1	232
Other income/(losses)									587	(791)	(95)
Interest expense									1,370	1,346	773
Depreciation and amortization									1,021	1,145	626
Impairment of goodwill									27	43	0
Impairment of tangible and other intangible assets									441	35	0
Other operating costs									136	155	65
Stock-based compensation expense									88	79	43
Other items									74	112	90
Adjusted EBITDA									2,405	2,308	1,361
Las Vegas
Segment Reporting Information [Line Items]
Impairment of goodwill									0	0
Other U.S.
Segment Reporting Information [Line Items]
Impairment of goodwill									27	17
All Other
Segment Reporting Information [Line Items]
Impairment of goodwill									0	26
Operating Segments | Las Vegas
Segment Reporting Information [Line Items]
Net income/(loss) attributable to Caesars									229	392	484
Net loss attributable to noncontrolling interests									0	0	0
Income tax benefit									0	0	0
Gain on deconsolidation of subsidiary											0
Restructuring and support expenses											0
Loss on extinguishment of debt										0	4
Other income/(losses)									1	(3)	(4)
Interest expense									330	327	65
Depreciation and amortization									495	582	420
Impairment of goodwill									0	0
Impairment of tangible and other intangible assets									380	0
Other operating costs									22	52	25
Stock-based compensation expense									8	8	4
Other items									3	4	9
Adjusted EBITDA									1,468	1,362	1,007
Operating Segments | Other U.S.
Segment Reporting Information [Line Items]
Net income/(loss) attributable to Caesars									(46)	(122)	(103)
Net loss attributable to noncontrolling interests									0	2	(7)
Income tax benefit									0	0	(2)
Gain on deconsolidation of subsidiary											(31)
Restructuring and support expenses											177
Loss on extinguishment of debt										0	13
Other income/(losses)									(1)	(2)	(1)
Interest expense									572	556	153
Depreciation and amortization									455	501	186
Impairment of goodwill									27	17
Impairment of tangible and other intangible assets									11	26
Other operating costs									22	21	3
Stock-based compensation expense									10	10	3
Other items									2	5	7
Adjusted EBITDA									1,052	1,014	398
Operating Segments | All Other
Segment Reporting Information [Line Items]
Net income/(loss) attributable to Caesars									(1,378)	33	(749)
Net loss attributable to noncontrolling interests									(3)	(1)	0
Income tax benefit									(141)	(121)	(1,993)
Gain on deconsolidation of subsidiary											0
Restructuring and support expenses											1,851
Loss on extinguishment of debt										1	215
Other income/(losses)									587	(786)	(90)
Interest expense									468	463	555
Depreciation and amortization									71	62	20
Impairment of goodwill									0	26
Impairment of tangible and other intangible assets									50	9
Other operating costs									92	82	37
Stock-based compensation expense									70	61	36
Other items									69	103	74
Adjusted EBITDA									(115)	(68)	(44)
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net income/(loss) attributable to Caesars									0	0	0
Net loss attributable to noncontrolling interests									0	0	0
Income tax benefit									0	0	0
Gain on deconsolidation of subsidiary											0
Restructuring and support expenses											0
Loss on extinguishment of debt										0	0
Other income/(losses)									0	0	0
Interest expense									0	0	0
Depreciation and amortization									0	0	0
Impairment of goodwill									0	0
Impairment of tangible and other intangible assets									0	0
Other operating costs									0	0	0
Stock-based compensation expense									0	0	0
Other items									0	0	0
Adjusted EBITDA									$ 0	$ 0	$ 0