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Debt - Credit Facilities (Details)
$ in Millions
 1 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2024
USD ($)
extension
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Sep. 30, 2025
CAD ($)
Dec. 31, 2024
CAD ($)
Oct. 31, 2023
USD ($)
Feb. 28, 2023
USD ($)
Aug. 31, 2022
USD ($)
May 31, 2022
USD ($)
Jan. 31, 2022
USD ($)
Debt Instrument [Line Items]                    
Letters of credit utilizing availability under our credit facilities   $ 320,000,000 $ 317,000,000              
Remaining borrowing capacity   2,400,000,000 2,200,000,000              
Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Long-term debt   $ 147,000,000 514,000,000              
Line of Credit | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Number of available extensions | extension 2                  
Extension period 1 year                  
Facility feature, increase limit $ 1,000,000,000                  
Basis spread   0.805%                
Uncommitted Revolver                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity                   $ 200,000,000
Principal   $ 68,000,000 0              
Long-term debt   68,000,000 0              
Credit facilities: The Credit Facility                    
Debt Instrument [Line Items]                    
Principal   147,000,000 514,000,000              
Long-term debt   147,000,000 514,000,000              
Credit facilities: The Credit Facility | Line of Credit                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity $ 3,500,000,000                  
Canadian Sublimit | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity             $ 1,000,000,000      
Long-term debt       $ 204 $ 232          
Credit facilities: Commercial Paper Facility                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity           $ 1,500,000,000   $ 1,000,000,000.0 $ 500,000,000  
Principal   598,000,000 477,000,000              
Long-term debt   $ 598,000,000 $ 477,000,000              
Weighted average interest rate   4.249% 4.646% 4.249% 4.646%          
Credit facilities: Commercial Paper Facility | Weighted Average                    
Debt Instrument [Line Items]                    
Debt instrument, term   8 days 18 days