Shareholders' Equity - Additional Information (Details)			12 Months Ended
	Apr. 15, 2020	Apr. 01, 2020 shares	Dec. 31, 2020 stock $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 shares	Dec. 31, 2015 USD ($)	Oct. 01, 2018 $ / shares shares	Feb. 28, 2017 USD ($)
Class of Stock [Line Items]
Authorized common stock (in shares)					135,000,000		250,000,000
Common stock, par value (in dollars per share) | $ / shares							$ 0.01
Stock repurchase program, period in force						3 years
Authorized shares (in shares)			50,000,000	50,000,000			50,000,000
Preferred stock, par value (in dollars per share) | $ / shares			$ 0.01	$ 0.01			$ 0.01
Outstanding shares (in shares)			0
2015 Program
Class of Stock [Line Items]
Authorized amount | $						$ 550,000,000
Remaining amount authorized to be repurchased | $								$ 112,000,000
2017 Program
Class of Stock [Line Items]
Authorized amount | $								$ 400,000,000
Remaining amount authorized to be repurchased | $				$ 231,000,000
Shares repurchased (in shares)				0	0
Class A
Class of Stock [Line Items]
Authorized common stock (in shares)			175,000,000	175,000,000			175,000,000
Common stock, par value (in dollars per share) | $ / shares			$ 0.01	$ 0.01
Class B common stock converted to Class A common stock (in shares)			3,485,215	0	0
Conversion of stock, shares converted (in shares)		5,055,091
Number of preferred stock | stock			1
Class A | Tenneco
Class of Stock [Line Items]
Acquisition of outstanding common stock voting percentage	4.90%
Class A | Icahn Enterprises L. P | Tenneco
Class of Stock [Line Items]
Noncontrolling interest ownership shares by noncontrolling owners (in shares)		9,958,628
Ownership percentage		14.99%
Class B
Class of Stock [Line Items]
Authorized common stock (in shares)			25,000,000	25,000,000
Common stock, par value (in dollars per share) | $ / shares			$ 0.01	$ 0.01
Class B common stock converted to Class A common stock (in shares)			(3,485,215)	0	0
Conversion of stock, shares converted (in shares)		5,055,091
Number of preferred stock | stock			1
Class B | Icahn Enterprises L. P | Tenneco
Class of Stock [Line Items]
Noncontrolling interest ownership shares by noncontrolling owners (in shares)		15,253,363