Shareholders' Equity - Share Conversion (Details) - shares	1 Months Ended	3 Months Ended
	May 06, 2021	Mar. 31, 2021
Class B
Conversion of Stock [Line Items]
Shares converted (in shares)		17,232,791
Class B | Subsequent Event
Conversion of Stock [Line Items]
Shares converted (in shares)	3,075,663
Class A
Conversion of Stock [Line Items]
Shares converted (in shares)		17,232,791
Class A | Subsequent Event
Conversion of Stock [Line Items]
Shares converted (in shares)	3,075,663
Tenneco | Icahn Enterprises L.P. | Class B
Conversion of Stock [Line Items]
Shares owned (in shares)		3,075,663
Tenneco | Icahn Enterprises L.P. | Class A
Conversion of Stock [Line Items]
Ownership percentage		12.16%
Shares owned (in shares)		9,589,751
Tenneco | Icahn Enterprises L.P. | Class A | Subsequent Event
Conversion of Stock [Line Items]
Ownership percentage	12.64%
Shares owned (in shares)	10,359,643