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Derivatives and Other Financial Instruments - Schedule of Reconciliation of Activity for Derivative Contracts (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2024
USD ($)
Financial Contracts [Member]  
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Fair value measurement, Assets, Beginning balance $ 16
Other comprehensive income (unrealized) 0
Settlements and other 1
Fair value measurement, Assets, Ending balance 12
Financial Contracts [Member] | Sales [Member]  
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Fair value measurement, Assets 0
Financial Contracts [Member] | Other Expenses, Net [Member]  
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Fair value measurement, Assets (5)
Financial Contracts [Member] | Other Expenses, Net [Member]  
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Fair value measurement, Assets (5)
Power Contract [Member]  
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Fair value measurement, Assets, Beginning balance 0
Other comprehensive income (unrealized) 1
Settlements and other 0
Fair value measurement, Assets, Ending balance 0
Fair value measurement, Liabilities, Beginning balance 1,297
Fair value measurement, Liabilities $ (58)
Revenue from Contract with Customer, Product and Service [Extensible Enumeration] Revenue from Contract with Customer, Excluding Assessed Tax
Other comprehensive income (unrealized) $ (119)
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Liability, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax
Fair value measurement, Liabilities, Ending balance $ 1,120
Power Contract [Member] | Sales [Member]  
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Fair value measurement, Assets (1)
Power Contract [Member] | Other Expenses, Net [Member]  
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Fair value measurement, Assets 0
Power Contract [Member] | Other Expenses, Net [Member]  
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Fair value measurement, Assets $ 0