Revenue from Contracts with Customers - Net Revenue From External Customers and Intercompany Revenue From Each Operating Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Disaggregation of Revenue [Line Items]
Net revenue	$ 696	$ 683	$ 2,339	$ 2,260
Disclosure of complimentary revenue	16	15	48	45
Related Party
Disaggregation of Revenue [Line Items]
Net revenue	0	0	0	0
Gaming
Disaggregation of Revenue [Line Items]
Net revenue	272	265	799	794
Other
Disaggregation of Revenue [Line Items]
Net revenue	0	0	0	0
External Customer
Disaggregation of Revenue [Line Items]
Net revenue	696	683	2,339	2,260
External Customer \| Pari-mutuel, live and simulcast racing
Disaggregation of Revenue [Line Items]
Net revenue	108	108	400	393
External Customer \| Pari-mutuel, historical racing
Disaggregation of Revenue [Line Items]
Net revenue	258	252	780	755
External Customer \| Racing event-related services
Disaggregation of Revenue [Line Items]
Net revenue	4	4	198	179
External Customer \| Gaming
Disaggregation of Revenue [Line Items]
Net revenue	243	239	710	692
External Customer \| Other
Disaggregation of Revenue [Line Items]
Net revenue	83	80	251	241
Operating Segments \| External Customer
Disaggregation of Revenue [Line Items]
Net revenue	696	683	2,339	2,260
Operating Segments \| External Customer \| Pari-mutuel, live and simulcast racing
Disaggregation of Revenue [Line Items]
Net revenue	108	108	400	393
Operating Segments \| External Customer \| Pari-mutuel, historical racing
Disaggregation of Revenue [Line Items]
Net revenue	258	252	780	755
Operating Segments \| External Customer \| Racing event-related services
Disaggregation of Revenue [Line Items]
Net revenue	4	4	198	179
Operating Segments \| External Customer \| Gaming
Disaggregation of Revenue [Line Items]
Net revenue	243	239	710	692
Operating Segments \| External Customer \| Other
Disaggregation of Revenue [Line Items]
Net revenue	83	80	251	241
Operating Segments \| Live and Historical
Disaggregation of Revenue [Line Items]
Net revenue	308	300	1,148	1,083
Operating Segments \| Live and Historical \| Related Party
Disaggregation of Revenue [Line Items]
Net revenue	7	5	43	40
Operating Segments \| Live and Historical \| External Customer
Disaggregation of Revenue [Line Items]
Net revenue	308	300	1,148	1,083
Operating Segments \| Live and Historical \| External Customer \| Pari-mutuel, live and simulcast racing
Disaggregation of Revenue [Line Items]
Net revenue	16	16	80	81
Operating Segments \| Live and Historical \| External Customer \| Pari-mutuel, historical racing
Disaggregation of Revenue [Line Items]
Net revenue	258	252	780	741
Operating Segments \| Live and Historical \| External Customer \| Racing event-related services
Disaggregation of Revenue [Line Items]
Net revenue	4	4	197	178
Operating Segments \| Live and Historical \| External Customer \| Gaming
Disaggregation of Revenue [Line Items]
Net revenue	3	5	10	11
Operating Segments \| Live and Historical \| External Customer \| Other
Disaggregation of Revenue [Line Items]
Net revenue	27	23	81	72
Operating Segments \| Wagering Services and Solutions
Disaggregation of Revenue [Line Items]
Net revenue	116	118	392	383
Operating Segments \| Wagering Services and Solutions \| Related Party
Disaggregation of Revenue [Line Items]
Net revenue	10	9	30	28
Operating Segments \| Wagering Services and Solutions \| External Customer
Disaggregation of Revenue [Line Items]
Net revenue	116	118	392	383
Operating Segments \| Wagering Services and Solutions \| External Customer \| Pari-mutuel, live and simulcast racing
Disaggregation of Revenue [Line Items]
Net revenue	87	87	301	292
Operating Segments \| Wagering Services and Solutions \| External Customer \| Pari-mutuel, historical racing
Disaggregation of Revenue [Line Items]
Net revenue	0	0	0	0
Operating Segments \| Wagering Services and Solutions \| External Customer \| Racing event-related services
Disaggregation of Revenue [Line Items]
Net revenue	0	0	0	0
Operating Segments \| Wagering Services and Solutions \| External Customer \| Gaming
Disaggregation of Revenue [Line Items]
Net revenue	3	4	13	12
Operating Segments \| Wagering Services and Solutions \| External Customer \| Other
Disaggregation of Revenue [Line Items]
Net revenue	26	27	78	79
Operating Segments \| Gaming
Disaggregation of Revenue [Line Items]
Net revenue	272	265	799	794
Operating Segments \| Gaming \| Related Party
Disaggregation of Revenue [Line Items]
Net revenue	1	1	6	5
Operating Segments \| Gaming \| External Customer
Disaggregation of Revenue [Line Items]
Net revenue	272	265	799	794
Operating Segments \| Gaming \| External Customer \| Pari-mutuel, live and simulcast racing
Disaggregation of Revenue [Line Items]
Net revenue	5	5	19	20
Operating Segments \| Gaming \| External Customer \| Pari-mutuel, historical racing
Disaggregation of Revenue [Line Items]
Net revenue	0	0	0	14
Operating Segments \| Gaming \| External Customer \| Racing event-related services
Disaggregation of Revenue [Line Items]
Net revenue	0	0	1	1
Operating Segments \| Gaming \| External Customer \| Gaming
Disaggregation of Revenue [Line Items]
Net revenue	237	230	687	669
Operating Segments \| Gaming \| External Customer \| Other
Disaggregation of Revenue [Line Items]
Net revenue	30	30	92	90
All Other
Disaggregation of Revenue [Line Items]
Net revenue	0	0	0	0
All Other \| Related Party
Disaggregation of Revenue [Line Items]
Net revenue	2	2	6	6
All Other \| External Customer
Disaggregation of Revenue [Line Items]
Net revenue	0	0	0	0
All Other \| External Customer \| Pari-mutuel, live and simulcast racing
Disaggregation of Revenue [Line Items]
Net revenue	0	0	0	0
All Other \| External Customer \| Pari-mutuel, historical racing
Disaggregation of Revenue [Line Items]
Net revenue	0	0	0	0
All Other \| External Customer \| Racing event-related services
Disaggregation of Revenue [Line Items]
Net revenue	0	0	0	0
All Other \| External Customer \| Gaming
Disaggregation of Revenue [Line Items]
Net revenue	0	0	0	0
All Other \| External Customer \| Other
Disaggregation of Revenue [Line Items]
Net revenue	0	0	0	0
Eliminations \| Related Party
Disaggregation of Revenue [Line Items]
Net revenue	(20)	(17)	(85)	(79)
Churchill Downs Racetrack \| Operating Segments \| Live and Historical
Disaggregation of Revenue [Line Items]
Net revenue	12	11	262	243
Louisville \| Operating Segments \| Live and Historical
Disaggregation of Revenue [Line Items]
Net revenue	54	54	168	163
Northern Kentucky \| Operating Segments \| Live and Historical
Disaggregation of Revenue [Line Items]
Net revenue	29	26	94	84
Southwestern Kentucky \| Operating Segments \| Live and Historical
Disaggregation of Revenue [Line Items]
Net revenue	48	42	141	126
Western Kentucky \| Operating Segments \| Live and Historical
Disaggregation of Revenue [Line Items]
Net revenue	23	22	60	50
Virginia \| Operating Segments \| Live and Historical
Disaggregation of Revenue [Line Items]
Net revenue	139	140	410	406
New Hampshire \| Operating Segments \| Live and Historical
Disaggregation of Revenue [Line Items]
Net revenue	3	5	13	11
Florida \| Operating Segments \| Gaming
Disaggregation of Revenue [Line Items]
Net revenue	21	23	69	74
Iowa \| Operating Segments \| Gaming
Disaggregation of Revenue [Line Items]
Net revenue	23	24	71	71
Indiana \| Operating Segments \| Gaming
Disaggregation of Revenue [Line Items]
Net revenue	34	33	102	97
Louisiana \| Operating Segments \| Gaming
Disaggregation of Revenue [Line Items]
Net revenue	27	26	92	103
Maine \| Operating Segments \| Gaming
Disaggregation of Revenue [Line Items]
Net revenue	31	29	82	81
Maryland \| Operating Segments \| Gaming
Disaggregation of Revenue [Line Items]
Net revenue	32	31	81	77
Mississippi \| Operating Segments \| Gaming
Disaggregation of Revenue [Line Items]
Net revenue	23	22	71	71
New York \| Operating Segments \| Gaming
Disaggregation of Revenue [Line Items]
Net revenue	51	48	148	139
Pennsylvania \| Operating Segments \| Gaming
Disaggregation of Revenue [Line Items]
Net revenue	$ 30	$ 29	$ 83	$ 81