v3.26.3
Debt and Derivatives - Narrative (Details)
$ in Millions, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2026
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2026
CAD ($)
Sep. 30, 2026
USD ($)
Sep. 30, 2026
USD ($)
Sep. 30, 2025
USD ($)
Jul. 31, 2026
CAD ($)
Jun. 30, 2026
CAD ($)
Dec. 31, 2025
USD ($)
Debt                  
Debt maturing within the next 12 months       $ 4,400 $ 4,400        
Debt classified as long-term due to intent and ability to refinance on long-term basis       2,900 2,900        
Current portion of long-term debt       1,524 1,524       $ 711
Proceeds from issuance of debt   $ 490 $ 696            
Tax-exempt bonds issued         18,644 $ 14,956      
Debt repayments         18,668 $ 15,772      
Interest Rate Swap                  
Debt                  
Interest rate swaps       750 750       $ 0
Other Debt Obligations                  
Debt                  
Debt maturing within the next 12 months       211 211        
Certain Fixed-Rate Senior Notes                  
Debt                  
Reduction to the carrying amount of hedged senior notes         42        
Tax Exempt Bonds Due 2055 | Bonds                  
Debt                  
Debt maturing within the next 12 months       2,200 $ 2,200        
Tax-exempt bonds issued       $ 100          
Tax Exempt Bonds Due 2055 | Minimum | Bonds                  
Debt                  
Interest rate (as a percent)       0.95% 0.95%        
Tax Exempt Bonds Due 2055 | Maximum | Bonds                  
Debt                  
Interest rate (as a percent)       4.60% 4.60%        
Commercial Paper Program | Commercial Paper                  
Debt                  
Debt maturing within the next 12 months       $ 1,200 $ 1,200        
Senior Notes Due 2027 | Senior Notes                  
Debt                  
Debt maturing within the next 12 months       $ 750 $ 750        
Interest rate (as a percent)       4.95% 4.95%        
$3.5 Billion Revolving Credit Facility | Commercial Paper                  
Debt                  
Debt term         397 days        
Commercial paper repayments         $ 17,900        
Commercial paper borrowings         18,100        
$3.5 Billion Revolving Credit Facility | Commercial Paper | Revolving Credit Facility                  
Debt                  
Outstanding borrowings under credit facility       $ 1,200 1,200        
$3.5 Billion Revolving Credit Facility | Line of Credit | Revolving Credit Facility                  
Debt                  
Maximum capacity       3,500 3,500        
Outstanding borrowings under credit facility       0 0        
Unused and available credit capacity       2,000 2,000        
Letters of credit outstanding       229 $ 229        
$3.5 Billion Revolving Credit Facility | Minimum | Line of Credit | Revolving Credit Facility                  
Debt                  
Spread rate (as a percent)         0.585%        
$3.5 Billion Revolving Credit Facility | Maximum | Line of Credit | Revolving Credit Facility                  
Debt                  
Spread rate (as a percent)         1.025%        
Other Letter Of Credit Lines                  
Debt                  
Letters of credit outstanding       $ 944 $ 944        
Senior Notes Due 2026 | Senior Notes                  
Debt                  
Interest rate (as a percent) 7.10%                
Debt instrument, amount repaid $ 223                
Canadian Senior Notes Due 2033 | Senior Notes                  
Debt                  
Interest rate (as a percent)   3.944%   3.944% 3.944%     3.944%  
Debt instrument, face amount   $ 493           $ 700  
Canadian Senior Notes Due 2026 | Senior Notes                  
Debt                  
Interest rate (as a percent)             2.60%    
Debt instrument, amount repurchased             $ 500    
Financing leases and other                  
Debt                  
Non-cash financing lease incurred         $ 499        
Debt repayments         $ 153