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Fair Value Measurements - Schedule of Fair Value Measurements of Asset and Liability Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Assets:    
Derivative assets $ 6 $ 19
Liabilities:    
Derivative liabilities 6 2
Level 1    
Assets:    
Total assets 0 0
Liabilities:    
Environmental credit obligations 0 0
Total liabilities 0 1
Level 1 | Commodity price swaps    
Assets:    
Derivative assets 0  
Liabilities:    
Derivative liabilities 0  
Level 1 | Commodity forward contracts    
Assets:    
Derivative assets 0 0
Liabilities:    
Derivative liabilities 0 0
Level 1 | NYMEX futures contracts    
Liabilities:    
Derivative liabilities   1
Level 1 | Foreign currency forward contracts    
Assets:    
Derivative assets 0 0
Liabilities:    
Derivative liabilities 0  
Level 2    
Assets:    
Total assets 4 19
Liabilities:    
Environmental credit obligations 73 10
Total liabilities 79 11
Level 2 | Commodity price swaps    
Assets:    
Derivative assets 0  
Liabilities:    
Derivative liabilities 1  
Level 2 | Commodity forward contracts    
Assets:    
Derivative assets 1 1
Liabilities:    
Derivative liabilities 1 1
Level 2 | NYMEX futures contracts    
Liabilities:    
Derivative liabilities   0
Level 2 | Foreign currency forward contracts    
Assets:    
Derivative assets 3 18
Liabilities:    
Derivative liabilities 4  
Level 3    
Assets:    
Total assets 2 0
Liabilities:    
Environmental credit obligations 0 0
Total liabilities 0 0
Level 3 | Commodity price swaps    
Assets:    
Derivative assets 2  
Liabilities:    
Derivative liabilities 0  
Level 3 | Commodity forward contracts    
Assets:    
Derivative assets 0 0
Liabilities:    
Derivative liabilities 0 0
Level 3 | NYMEX futures contracts    
Liabilities:    
Derivative liabilities   0
Level 3 | Foreign currency forward contracts    
Assets:    
Derivative assets 0 0
Liabilities:    
Derivative liabilities 0  
Carrying Amount    
Assets:    
Total assets 6 19
Liabilities:    
Environmental credit obligations 73 10
Total liabilities 79 12
Carrying Amount | Commodity price swaps    
Assets:    
Derivative assets 2  
Liabilities:    
Derivative liabilities 1  
Carrying Amount | Commodity forward contracts    
Assets:    
Derivative assets 1 1
Liabilities:    
Derivative liabilities 1 1
Carrying Amount | NYMEX futures contracts    
Liabilities:    
Derivative liabilities   1
Carrying Amount | Foreign currency forward contracts    
Assets:    
Derivative assets 3 $ 18
Liabilities:    
Derivative liabilities $ 4