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Fair Value (Nonrecurring Measurements) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
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 $ (230,000,000) $ (131,000,000) $ (230,000,000) $ (131,000,000) $ (236,000,000) $ (245,000,000) $ (130,000,000) $ (115,000,000)
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 (25,000,000) (22,000,000) (25,000,000) (22,000,000) $ (27,000,000) $ (40,000,000) $ 2,000,000 $ (21,000,000)
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 (3,000,000)   (3,000,000)          
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 (28,000,000)   (28,000,000)          
Other Credit Derivatives                
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 6,000,000   6,000,000          
Mong Duong held-for-sale                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Long-Lived Asset, Change to Plan of Sale, Reclassification from Held-for-Sale to Held-and-Used, Impairment Loss   243,000,000            
Mong Duong held-for-sale | Measurement Input, Cost to Sell                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Long-Lived Asset, Change to Plan of Sale, Reclassification from Held-for-Sale to Held-and-Used, Impairment Loss 4,000,000              
Mong Duong Subsidiary [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Selling Expense       5,000,000        
Weighted Average [Member] | Commodity                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Derivative, Commodity prices     $ 51.18          
Derivative, Underlying     48.42          
Maximum [Member] | Commodity                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Derivative, Commodity prices     $ 132.82          
Derivative, Underlying     95.62          
Minimum [Member] | Commodity                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Derivative, Commodity prices     $ 4.21          
Derivative, Underlying     23.54          
Long Lived Assets held and Used | Mong Duong held-for-sale                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Other Asset Impairment Charges     $ 239,000,000          
Long-Lived Asset, Change to Plan of Sale, Reclassification from Held-for-Sale to Held-and-Used, Impairment Loss $ 239,000,000              
Long Lived Assets Held For Sale | Mong Duong held-for-sale                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Assets Carrying Amount Disclosure Nonrecurring   383,000,000   383,000,000        
Other Asset Impairment Charges       17,000,000        
Long Lived Assets Held For Sale | 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 For Sale | 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   371,000,000   371,000,000        
Long Lived Assets Held For Sale | 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