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Fair Value Measurements (Details 2) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Debt Instrument, Fair Value Disclosure [Abstract]      
Impairment of equity method investment in PLNL $ 0 $ 0 $ 43
Recurring basis      
Assets and liabilities measured at fair value on a recurring basis      
Cash equivalents 1,353 1,446  
Nonqualified employee benefit trusts 18 17  
Derivative assets 1 4  
Derivative liabilities (5) (3)  
Recurring basis | Quoted Prices in Active Markets (Level 1)      
Assets and liabilities measured at fair value on a recurring basis      
Cash equivalents 1,353 1,446  
Nonqualified employee benefit trusts 18 17  
Derivative assets 0 0  
Derivative liabilities 0 0  
Recurring basis | Significant Other Observable Inputs (Level 2)      
Assets and liabilities measured at fair value on a recurring basis      
Cash equivalents 0 0  
Nonqualified employee benefit trusts 0 0  
Derivative assets 1 4  
Derivative liabilities (5) (3)  
Recurring basis | Significant Unobservable Inputs (Level 3)      
Assets and liabilities measured at fair value on a recurring basis      
Cash equivalents 0 0  
Nonqualified employee benefit trusts 0 0  
Derivative assets 0 0  
Derivative liabilities 0 0  
Point Lisas Nitrogen Limited (PLNL)      
Debt Instrument, Fair Value Disclosure [Abstract]      
Impairment of equity method investment in PLNL     $ 43
Estimate of Fair Value Measurement      
Debt Instrument, Fair Value Disclosure [Abstract]      
Long-term debt, Fair Value 3,131 2,827  
Reported Value Measurement      
Debt Instrument, Fair Value Disclosure [Abstract]      
Long-term debt, Fair Value $ 3,215 $ 2,971