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Derivatives - Fair Value and Classification (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Derivatives, Fair Value [Line Items]    
Total assets $ 375 $ 281
Total liabilities 220 256
Interest rate swaps | Location, Statement of Financial Position, Balance [Axis]: us-gaap:AccruedLiabilitiesCurrent    
Derivatives, Fair Value [Line Items]    
Total liabilities 8 32
Interest rate swaps | Location, Statement of Financial Position, Balance [Axis]: us-gaap:DerivativeAssetsCurrent    
Derivatives, Fair Value [Line Items]    
Total assets 31 36
Interest rate swaps | Location, Statement of Financial Position, Balance [Axis]: us-gaap:DerivativeAssetsNoncurrent    
Derivatives, Fair Value [Line Items]    
Total assets 263 203
Interest rate swaps | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesNoncurrent    
Derivatives, Fair Value [Line Items]    
Total liabilities 27 63
Natural gas supply contracts | Location, Statement of Financial Position, Balance [Axis]: us-gaap:AccruedLiabilitiesCurrent    
Derivatives, Fair Value [Line Items]    
Total liabilities 71 72
Natural gas supply contracts | Location, Statement of Financial Position, Balance [Axis]: us-gaap:DerivativeAssetsCurrent    
Derivatives, Fair Value [Line Items]    
Total assets 66 29
Natural gas supply contracts | Location, Statement of Financial Position, Balance [Axis]: us-gaap:DerivativeAssetsNoncurrent    
Derivatives, Fair Value [Line Items]    
Total assets 15 13
Natural gas supply contracts | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesNoncurrent    
Derivatives, Fair Value [Line Items]    
Total liabilities $ 114 $ 89