v3.25.2
Debt - Long-term debt (Details)
€ in Millions, $ in Millions
Jun. 30, 2025
USD ($)
Jun. 30, 2025
EUR (€)
May 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Long-term debt [Line Items]        
Total $ 11,706     $ 11,030
Less current maturities (495)     (498)
Long-term debt 11,211     10,532
Senior Notes due 2055, $1,000 million, 4.625% ($15 million of discount; $10 million of debt issuance cost)        
Long-term debt [Line Items]        
Face amount $ 1,000      
Stated interest rate (in percent) 4.625% 4.625%    
Unamortized discount $ 15      
Unamortized debt issuance cost 10      
Total 975     975
Guaranteed Notes due 2027, $300 million, 8.1%        
Long-term debt [Line Items]        
Face amount $ 300      
Stated interest rate (in percent) 8.10% 8.10%    
Total $ 300     300
Guaranteed Notes due 2043, $750 million, 5.25% ($17 million of discount; $6 million of debt issuance cost) | Issued by LYB International Finance B.V.:        
Long-term debt [Line Items]        
Face amount $ 750      
Stated interest rate (in percent) 5.25% 5.25%    
Unamortized discount $ 17      
Unamortized debt issuance cost 6      
Total 727     726
Guaranteed Notes due 2044, $1,000 million, 4.875% ($9 million of discount; $8 million of debt issuance cost) | Issued by LYB International Finance B.V.:        
Long-term debt [Line Items]        
Face amount $ 1,000      
Stated interest rate (in percent) 4.875% 4.875%    
Unamortized discount $ 9      
Unamortized debt issuance cost 8      
Total $ 983     983
Guaranteed Notes due 2026, €500 million, 0.875% ($1 million of debt issuance cost) | Issued by LYB International Finance II B.V.:        
Long-term debt [Line Items]        
Face amount | €   € 500    
Stated interest rate (in percent) 0.875% 0.875%    
Unamortized debt issuance cost $ 1      
Total 582     515
Guaranteed Notes due 2027, $1,000 million, 3.5% ($1 million of discount; $1 million of debt issuance cost) | Issued by LYB International Finance II B.V.:        
Long-term debt [Line Items]        
Face amount $ 1,000      
Stated interest rate (in percent) 3.50% 3.50%    
Unamortized discount $ 1      
Unamortized debt issuance cost 1      
Total $ 588     584
Guaranteed Notes due 2031, €500 million, 1.625% ($3 million of discount; $2 million of debt issuance cost) | Issued by LYB International Finance II B.V.:        
Long-term debt [Line Items]        
Face amount | €   € 500    
Stated interest rate (in percent) 1.625% 1.625%    
Unamortized discount $ 3      
Unamortized debt issuance cost 2      
Total 579     514
Guaranteed Notes due 2025, $500 million, 1.25% | Issued by LYB International Finance III LLC:        
Long-term debt [Line Items]        
Face amount $ 500      
Stated interest rate (in percent) 1.25% 1.25%    
Total $ 490     487
Guaranteed Notes due 2030, $500 million, 3.375% ($1 million of debt issuance cost) | Issued by LYB International Finance III LLC:        
Long-term debt [Line Items]        
Face amount $ 500      
Stated interest rate (in percent) 3.375% 3.375%    
Unamortized debt issuance cost $ 1      
Total 128     123
Guaranteed Notes due 2030, $500 million, 2.25% ($2 million of discount; $3 million of debt issuance cost) | Issued by LYB International Finance III LLC:        
Long-term debt [Line Items]        
Face amount $ 500      
Stated interest rate (in percent) 2.25% 2.25%    
Unamortized discount $ 2      
Unamortized debt issuance cost 3      
Total 479     473
Guaranteed Notes due 2033, $500 million, 5.625% ($5 million of debt issuance cost) | Issued by LYB International Finance III LLC:        
Long-term debt [Line Items]        
Face amount $ 500      
Stated interest rate (in percent) 5.625% 5.625%    
Unamortized debt issuance cost $ 5      
Total 495     495
Guaranteed Notes due 2034, $750 million, 5.5% ($5 million of discount, $6 million of debt issuance cost) | Issued by LYB International Finance III LLC:        
Long-term debt [Line Items]        
Face amount $ 750      
Stated interest rate (in percent) 5.50% 5.50%    
Unamortized discount $ 5      
Unamortized debt issuance cost 6      
Total 739     738
Guaranteed Notes due 2035, $500 million, 6.150% ($1 million of discount, $5 million of debt issuance cost | Issued by LYB International Finance III LLC:        
Long-term debt [Line Items]        
Face amount $ 500   $ 500  
Stated interest rate (in percent) 6.15% 6.15% 6.15%  
Unamortized discount $ 1      
Unamortized debt issuance cost 5      
Total 494     0
Guaranteed Notes due 2040, $750 million, 3.375% ($1 million of discount; $7 million of debt issuance cost) | Issued by LYB International Finance III LLC:        
Long-term debt [Line Items]        
Face amount $ 750      
Stated interest rate (in percent) 3.375% 3.375%    
Unamortized discount $ 1      
Unamortized debt issuance cost 7      
Total 742     742
Guaranteed Notes due 2049, $1,000 million, 4.2% ($13 million of discount; $10 million of debt issuance cost) | Issued by LYB International Finance III LLC:        
Long-term debt [Line Items]        
Face amount $ 1,000      
Stated interest rate (in percent) 4.20% 4.20%    
Unamortized discount $ 13      
Unamortized debt issuance cost 10      
Total 977     976
Guaranteed Notes due 2050, $1,000 million, 4.2% ($6 million of discount; $10 million of debt issuance cost) | Issued by LYB International Finance III LLC:        
Long-term debt [Line Items]        
Face amount $ 1,000      
Stated interest rate (in percent) 4.20% 4.20%    
Unamortized discount $ 6      
Unamortized debt issuance cost 10      
Total 984     982
Guaranteed Notes due 2051, $1,000 million, 3.625% ($2 million of discount; $10 million of debt issuance cost) | Issued by LYB International Finance III LLC:        
Long-term debt [Line Items]        
Face amount $ 1,000      
Stated interest rate (in percent) 3.625% 3.625%    
Unamortized discount $ 2      
Unamortized debt issuance cost 10      
Total 941     918
Guaranteed Notes due 2060, $500 million, 3.8% ($4 million of discount; $5 million of debt issuance cost) | Issued by LYB International Finance III LLC:        
Long-term debt [Line Items]        
Face amount $ 500      
Stated interest rate (in percent) 3.80% 3.80%    
Unamortized discount $ 4      
Unamortized debt issuance cost 5      
Total 486     482
Other        
Long-term debt [Line Items]        
Total $ 17     $ 17