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Debt - Additional Information (Detail) - USD ($)
 12 Months Ended
Sep. 12, 2024
Dec. 31, 2024
Sep. 11, 2024
Dec. 31, 2023
Debt Instrument [Line Items]        
Funds available under revolving credit facility   $ 1,500,000,000    
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] Canadian Dollar Offered Rate C D O R [Member]      
Variable rate 1.25%      
Capitalization ratio, Maximum 60.00%      
Capitalization ratio, Actual   23.80%    
Other debt   $ 153,000,000   $ 139,000,000
First payment   37,000,000    
Outstanding letters of credit under various bilateral letter of credit facilities   500,000,000    
Carrying value of Unsecured Senior Notes   1,587,000,000   1,586,000,000
Unsecured Debt [Member] | Fair Value, Inputs, Level 2 [Member]        
Debt Instrument [Line Items]        
Fair value of Unsecured Senior Notes   1,285,000,000   $ 1,316,000,000
Noncontrolling Interests [Member]        
Debt Instrument [Line Items]        
Other debt   58,000,000    
Other debt due in next twelve months   27,000,000    
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Credit facility, extendable borrowing capacity $ 2,500,000,000      
Line of credit facility current borrowing capacity     $ 2,000,000,000  
Variable rate basis Secured Overnight Financing Rate (SOFR), Euro Interbank Offered Rate (EURIBOR), Sterling Overnight Index Average (SONIA), Canadian Overnight Repo Rate Average (CORRA), or Norwegian Interbank Offered Rate (NIBOR),      
Outstanding letters of credit issued   0    
Foreign Line of Credit [Member]        
Debt Instrument [Line Items]        
Line of credit facility current borrowing capacity   $ 150,000,000    
Variable rate   1.40%    
Additional line of credit facility borrowing capacity   $ 120,000,000    
Debt to equity ratio maximum   75.00%    
Borrowings   $ 94,000,000    
First payment   $ 11,000,000    
Line of credit repayments beginning date   2022-12    
Line of credit repayments ending date   2032-06    
Unsecured Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Debt instrument, term 5 years      
Line of credit facility current borrowing capacity $ 1,500,000,000