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Derivatives and Other Financial Instruments - Schedule of Reconciliation of Activity for Derivative Contracts (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Financial Contracts [Member]    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value measurement, Assets, Beginning balance $ 52 $ 2
Other comprehensive (income) loss (unrealized) 0 20
Settlements and other (11) (141)
Fair value measurement, Assets, Ending balance 16 52
Financial Contracts [Member] | Sales [Member]    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value measurement, Assets 0 0
Financial Contracts [Member] | Cost of Goods Sold [Member]    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value measurement, Assets (20)  
Financial Contracts [Member] | Other Income Net [Member]    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value measurement, Assets (5) 171
Financial Contracts [Member] | Other Income Net [Member]    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value measurement, Assets (5) 171
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) loss (unrealized) 4  
Settlements and other 0  
Fair value measurement, Assets, Ending balance 0 0
Fair value measurement, Liabilities, Beginning balance 1,212 1,290
Fair value measurement, Liabilities $ (245) $ 0
Revenue from Contract with Customer, Product and Service [Extensible Enumeration] Sales (E)  
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]   Other (expenses) income, net (U)
Other comprehensive (income) loss (unrealized) $ 330 $ 267
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Liability, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] Net change in unrecognized gains/losses on cash flow hedges  
Fair value measurement, Liabilities, Ending balance $ 1,297 1,212
Power Contract [Member] | Sales [Member]    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value measurement, Assets (4)  
Fair value measurement, Liabilities   (345)
Power Contract [Member] | Cost of Goods Sold [Member]    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value measurement, Assets 0  
Power Contract [Member] | Other Income Net [Member]    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value measurement, Assets 0  
Fair value measurement, Liabilities   0
Power Contract [Member] | Other Income Net [Member]    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value measurement, Assets 0  
Embedded Credit Derivative [Member]    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value measurement, Liabilities, Beginning balance $ 0 3
Fair value measurement, Liabilities   $ (3)
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]   Other (expenses) income, net (U)
Other comprehensive (income) loss (unrealized)   $ 0
Fair value measurement, Liabilities, Ending balance   0
Embedded Credit Derivative [Member] | Sales [Member]    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value measurement, Liabilities   0
Embedded Credit Derivative [Member] | Other Income Net [Member]    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value measurement, Liabilities   $ (3)