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Schedule I - Condensed Financial Information of Parent (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]      
Aggregate general partner ownership interest of parent and operating subsidiary 1.99%    
Debt $ 8,059 $ 8,192  
Icahn Enterprises Holdings      
Condensed Financial Statements, Captions [Line Items]      
General partner ownership percentage in Icahn Enterprises 1.00%    
Affiliate ownership interest 99.00%    
Aggregate general partner ownership interest of parent and operating subsidiary 1.00%    
Icahn Enterprises Holdings (Parent)      
Condensed Financial Statements, Captions [Line Items]      
Net advances from subsidiaries $ 1,093 567 $ 238
Debt 5,813 6,300  
Icahn Enterprises (Parent)      
Condensed Financial Statements, Captions [Line Items]      
Net investment in and advances from subsidiaries 1,276 (363) $ 433
Debt $ 5,811 6,297  
5.875% senior unsecured notes due 2022 | Icahn Enterprises Holdings (Parent)      
Condensed Financial Statements, Captions [Line Items]      
Debt   $ 1,345  
Interest rate on debt instrument 5.875% 5.875%  
5.875% senior unsecured notes due 2022 | Icahn Enterprises (Parent)      
Condensed Financial Statements, Captions [Line Items]      
Debt   $ 1,345  
Interest rate on debt instrument 5.875% 5.875%  
6.250% senior unsecured notes due 2022 | Icahn Enterprises Holdings (Parent)      
Condensed Financial Statements, Captions [Line Items]      
Debt $ 1,208 $ 1,211  
Interest rate on debt instrument 6.25% 6.25%  
6.250% senior unsecured notes due 2022 | Icahn Enterprises (Parent)      
Condensed Financial Statements, Captions [Line Items]      
Debt $ 1,209 $ 1,211  
Interest rate on debt instrument 6.25% 6.25%  
6.750% senior unsecured notes due 2024 | Icahn Enterprises Holdings (Parent)      
Condensed Financial Statements, Captions [Line Items]      
Debt $ 500 $ 499  
Interest rate on debt instrument 6.75% 6.75%  
6.750% senior unsecured notes due 2024 | Icahn Enterprises (Parent)      
Condensed Financial Statements, Captions [Line Items]      
Debt $ 499 $ 498  
Interest rate on debt instrument 6.75% 6.75%  
4.750% senior unsecured notes due 2024 | Icahn Enterprises Holdings (Parent)      
Condensed Financial Statements, Captions [Line Items]      
Debt $ 1,107 $ 499  
Interest rate on debt instrument 4.75% 4.75%  
4.750% senior unsecured notes due 2024 | Icahn Enterprises (Parent)      
Condensed Financial Statements, Captions [Line Items]      
Debt $ 1,106 $ 498  
Interest rate on debt instrument 4.75% 4.75%  
6.375% senior unsecured notes due 2025 | Icahn Enterprises Holdings (Parent)      
Condensed Financial Statements, Captions [Line Items]      
Debt $ 749 $ 749  
Interest rate on debt instrument 6.375% 6.375%  
6.375% senior unsecured notes due 2025 | Icahn Enterprises (Parent)      
Condensed Financial Statements, Captions [Line Items]      
Debt $ 748 $ 748  
Interest rate on debt instrument 6.375% 6.375%  
6.250% senior unsecured notes due 2026 | Icahn Enterprises Holdings (Parent)      
Condensed Financial Statements, Captions [Line Items]      
Debt $ 1,250 $ 1,250  
Interest rate on debt instrument 6.25% 6.25%  
6.250% senior unsecured notes due 2026 | Icahn Enterprises (Parent)      
Condensed Financial Statements, Captions [Line Items]      
Debt $ 1,250 $ 1,250  
Interest rate on debt instrument 6.25% 6.25%  
5.250% senior unsecured notes due 2027 | Icahn Enterprises Holdings (Parent)      
Condensed Financial Statements, Captions [Line Items]      
Debt $ 999 $ 747  
Interest rate on debt instrument 5.25% 5.25%  
5.250% senior unsecured notes due 2027 | Icahn Enterprises (Parent)      
Condensed Financial Statements, Captions [Line Items]      
Debt $ 999 $ 747  
Interest rate on debt instrument 5.25% 5.25%