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Debt - Additional Information (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Funds available under revolving credit facility $ 1,950,000,000  
Capitalization ratio, Maximum 60.00%  
Capitalization ratio, Actual 24.50%  
Other debt $ 221,000,000 $ 139,000,000
Outstanding letters of credit under various bilateral letter of credit facilities 472,000,000  
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 1,380,000,000 $ 1,316,000,000
Noncontrolling Interests [Member]    
Debt Instrument [Line Items]    
Other debt 34,000,000  
Other debt due in next twelve months $ 3,000,000  
Canadian Dollar Offered Rate (CDOR) [Member]    
Debt Instrument [Line Items]    
Variable rate 1.25%  
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Line of credit facility current borrowing capacity $ 2,000,000,000  
Funds available under revolving credit facility 1,800,000,000  
Credit facility, extendable borrowing capacity $ 3,000,000,000  
Variable rate basis Secured Overnight Financing Rate (SOFR), NIBOR or CDOR  
Outstanding letters of credit issued $ 50,000,000  
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 $ 104,000,000  
First payment $ 10,000,000  
Line of credit repayments beginning date 2022-12  
Line of credit repayments ending date 2032-06