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Debt - Additional Information (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Funds available under revolving credit facility $ 1,500,000,000  
Variable rate 1.25%  
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] Canadian Dollar Offered Rate C D O R [Member]  
Capitalization ratio, Maximum 60.00%  
Capitalization ratio, Actual 23.60%  
Other debt $ 149,000,000 $ 153,000,000
Outstanding letters of credit under various bilateral letter of credit facilities 551,000,000  
Carrying value of Unsecured Senior Notes 1,588,000,000 1,587,000,000
Unsecured Debt [Member] | Fair Value, Inputs, Level 2 [Member]    
Debt Instrument [Line Items]    
Fair value of Unsecured Senior Notes 1,289,000,000 $ 1,285,000,000
Current and Former Minority Interest Partners [Member]    
Debt Instrument [Line Items]    
Other debt 54,000,000  
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  
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  
Line of credit facility, repayment date 2032-06  
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  
Unsecured Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Line of credit facility current borrowing capacity $ 1,500,000,000