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Derivatives - Pre-Tax Effects of Derivative Instruments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Derivative Instruments, Gain (Loss) [Line Items]        
Expense (income) and gain (loss) on derivatives     $ 153 $ (419)
Natural gas supply contracts | Location, Statement of Income, Balance [Axis]: us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization        
Derivative Instruments, Gain (Loss) [Line Items]        
Expense (income) and gain (loss) on derivatives $ (33) $ (77) 12 (115)
Natural gas supply contracts | Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpense        
Derivative Instruments, Gain (Loss) [Line Items]        
Expense (income) and gain (loss) on derivatives 5 0 2 0
Interest rate swaps        
Derivative Instruments, Gain (Loss) [Line Items]        
Expense (income) and gain (loss) on derivatives $ 124 $ (112) $ 139 $ (304)