Shareholders' Equity - Share Conversion (Details)	Apr. 01, 2020 shares
Class B
Conversion of Stock [Line Items]
Shares converted (in shares)	3,485,215
Class A
Conversion of Stock [Line Items]
Shares issued upon conversion (in shares)	3,485,215
Tenneco \| Icahn Enterprises L.P. \| Class B
Conversion of Stock [Line Items]
Shares owned (in shares)	20,308,454
Tenneco \| Icahn Enterprises L.P. \| Class A
Conversion of Stock [Line Items]
Shares owned (in shares)	9,136,392
Ownership percentage	14.99%

Noncontrolling Interest, Ownership, Shares By Noncontrolling Owners

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