Leases (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Leases (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Leases
Operating lease right-of-use asset	$ 478		$ 478		$ 527
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets		Other Assets		Other Assets
Operating lease liabilities	$ 487		$ 487		$ 530
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Accrued Liabilities		Accrued Liabilities		Accrued Liabilities
Finance lease right-of-use assets	$ 82		$ 82		$ 72
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Property, plant and equipment, net		Property, plant and equipment, net		Property, plant and equipment, net
Finance lease liabilities	$ 91		$ 91		$ 83
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Accrued Liabilities		Accrued Liabilities		Accrued Liabilities
Operating lease cost	$ 47	$ 46	$ 136	$ 132
Amortization of financing lease right-of-use assets	3	2	8	6
Interest expense on financing lease liabilities		2	5	5
Property, plant and equipment, net	3,742		3,742		$ 3,843
Maximum
Leases
Interest expense on financing lease liabilities	1
Energy
Leases
Operating lease right-of-use asset	67		67		75
Operating lease liabilities	$ 64		$ 64		$ 71
Lease term	4 years 10 months 24 days		4 years 10 months 24 days		5 years 4 months 24 days
Operating lease, discount rate percentage	8.30%		8.30%		7.90%
Property, plant and equipment, net	$ 2,401		$ 2,401		$ 2,504
Automotive
Leases
Operating lease right-of-use asset	370		370		409
Operating lease liabilities	$ 387		$ 387		$ 421
Lease term	5 years 3 months 18 days		5 years 3 months 18 days		5 years 4 months 24 days
Operating lease, discount rate percentage	5.90%		5.90%		5.90%
Operating lease cost			$ 100	106
Revenues from operating leases	$ 8	$ 15	$ 30	$ 45
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Operating Revenue	Other Operating Revenue	Other Operating Revenue	Other Operating Revenue
Variable lease costs	$ 23	$ 25	$ 68	$ 72
Property, plant and equipment, net	815		815		$ 808
Food Packaging
Leases
Operating lease right-of-use asset	20		20		19
Operating lease liabilities	$ 22		$ 22		$ 22
Lease term	8 years 2 months 12 days		8 years 2 months 12 days		9 years 1 month 6 days
Operating lease, discount rate percentage	7.60%		7.60%		7.40%
Property, plant and equipment, net	$ 133		$ 133		$ 124
Other Segments and Holding Company
Leases
Operating lease right-of-use asset	21		21		24
Operating lease liabilities	14		14		16
Real Estate Segment
Leases
Revenues from operating leases	3	$ 2	8	$ 7
Property, plant and equipment, net	334		334		350
Real Estate Segment \| Assets leased to others
Leases
Property, plant and equipment, net	$ 276		$ 276		$ 236

ICAHN ENTERPRISES L.P. 10-Q