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Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Assets    
Total $ 639 $ 636
Liabilities    
Total 238 271
Interest rate swaps    
Assets    
Derivative assets 302 245
Liabilities    
Derivative liabilities 43 102
Natural gas supply contracts    
Assets    
Derivative assets 91 51
Liabilities    
Derivative liabilities 195 169
Level 1    
Assets    
Total 246 340
Liabilities    
Total 0 0
Level 1 | Interest rate swaps    
Assets    
Derivative assets 0 0
Liabilities    
Derivative liabilities 0 0
Level 1 | Natural gas supply contracts    
Assets    
Derivative assets 0 0
Liabilities    
Derivative liabilities 0 0
Level 2    
Assets    
Total 303 246
Liabilities    
Total 46 122
Level 2 | Interest rate swaps    
Assets    
Derivative assets 302 245
Liabilities    
Derivative liabilities 43 102
Level 2 | Natural gas supply contracts    
Assets    
Derivative assets 1 1
Liabilities    
Derivative liabilities 3 20
Level 3    
Assets    
Total 90 50
Liabilities    
Total 192 149
Level 3 | Interest rate swaps    
Assets    
Derivative assets 0 0
Liabilities    
Derivative liabilities 0 0
Level 3 | Natural gas supply contracts    
Assets    
Derivative assets 90 50
Liabilities    
Derivative liabilities 192 149
Money market funds    
Assets    
Money market funds 246 340
Money market funds | Level 1    
Assets    
Money market funds 246 340
Money market funds | Level 2    
Assets    
Money market funds 0 0
Money market funds | Level 3    
Assets    
Money market funds $ 0 $ 0