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Fair Value (Nonrecurring Measurements) (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2025
USD ($)
Mar. 31, 2025
ARS ($)
Sep. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Other Asset Impairment Charges $ 49     $ 46    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs (130)     (175) $ (115) $ (220)
Commodity Contract [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 2     (79) $ (21) $ (110)
Other Contract [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs (2)          
Commodity Option            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 4          
Mong Duong held-for-sale            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Selling Expense $ 5          
Weighted Average [Member] | Commodity            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative, Commodity prices   $ 65.53        
Maximum [Member] | Commodity            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative, Commodity prices   132.30        
Minimum [Member] | Commodity            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative, Commodity prices   $ 7.89        
Long Lived Assets Held And Used [Member] | Mong Duong held-for-sale            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Other Asset Impairment Charges     $ 17 37    
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Mong Duong held-for-sale            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets Carrying Amount Disclosure Nonrecurring     383 450    
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Mong Duong held-for-sale | Level 1 [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets Carrying Amount Disclosure Nonrecurring     0 0    
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Mong Duong held-for-sale | Level 2 [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets Carrying Amount Disclosure Nonrecurring     371 413    
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Mong Duong held-for-sale | Level 3 [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets Carrying Amount Disclosure Nonrecurring     $ 0 $ 0