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Fair Value Measurements (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Assets:    
Derivative assets $ 3 $ 19
Liabilities:    
Derivative liabilities 11 2
NYMEX futures contracts    
Assets:    
Derivative assets 1 0
Liabilities:    
Derivative liabilities 0 1
Foreign currency forward contracts    
Assets:    
Derivative assets 0 18
Liabilities:    
Derivative liabilities 10 0
Level 1    
Assets:    
Total assets 1 0
Liabilities:    
Environmental credit obligations 0 0
Total liabilities 0 1
Level 1 | NYMEX futures contracts    
Assets:    
Derivative assets 1  
Liabilities:    
Derivative liabilities   1
Level 1 | Commodity forward contracts    
Assets:    
Derivative assets 0 0
Liabilities:    
Derivative liabilities 0 0
Level 1 | Foreign currency forward contracts    
Assets:    
Derivative assets   0
Liabilities:    
Derivative liabilities 0  
Level 2    
Assets:    
Total assets 2 19
Liabilities:    
Environmental credit obligations 103 10
Total liabilities 114 11
Level 2 | NYMEX futures contracts    
Assets:    
Derivative assets 0  
Liabilities:    
Derivative liabilities   0
Level 2 | Commodity forward contracts    
Assets:    
Derivative assets 2 1
Liabilities:    
Derivative liabilities 1 1
Level 2 | Foreign currency forward contracts    
Assets:    
Derivative assets   18
Liabilities:    
Derivative liabilities 10  
Level 3    
Assets:    
Total assets 0 0
Liabilities:    
Environmental credit obligations 0 0
Total liabilities 0 0
Level 3 | NYMEX futures contracts    
Assets:    
Derivative assets 0  
Liabilities:    
Derivative liabilities   0
Level 3 | Commodity forward contracts    
Assets:    
Derivative assets 0 0
Liabilities:    
Derivative liabilities 0 0
Level 3 | Foreign currency forward contracts    
Assets:    
Derivative assets   0
Liabilities:    
Derivative liabilities 0  
Reported Value Measurement    
Assets:    
Total assets 3 19
Liabilities:    
Environmental credit obligations 103 10
Total liabilities 114 12
Reported Value Measurement | NYMEX futures contracts    
Assets:    
Derivative assets 1  
Liabilities:    
Derivative liabilities   1
Reported Value Measurement | Commodity forward contracts    
Assets:    
Derivative assets 2 1
Liabilities:    
Derivative liabilities 1 1
Reported Value Measurement | Foreign currency forward contracts    
Assets:    
Derivative assets   $ 18
Liabilities:    
Derivative liabilities $ 10