v3.25.3
BORROWINGS - Narrative (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
Sep. 30, 2025
USD ($)
series
Dec. 31, 2024
USD ($)
Jun. 30, 2025
USD ($)
Debt Instrument [Line Items]        
Principal debt issued   $ 10,275,000,000 $ 9,036,000,000  
Guarantee obligation, carrying value   3,000,000 3,000,000  
Commercial contracts        
Debt Instrument [Line Items]        
Guarantor obligations, maximum exposure   907,000,000 784,000,000  
Equipment residual value obligation        
Debt Instrument [Line Items]        
Guarantor obligations, maximum exposure   24,000,000 25,000,000  
Senior notes        
Debt Instrument [Line Items]        
Debt, principal amount   $ 9,750,000,000    
Number of debt series | series   8    
Line of credit | Revolving credit facility        
Debt Instrument [Line Items]        
Line of credit outstanding   $ 0 0  
4.800% senior notes due January 15, 2031 | Senior notes        
Debt Instrument [Line Items]        
Debt, principal amount       $ 650,000,000
Stated interest rate   4.80%   4.80%
Principal debt issued   $ 650,000,000 0  
5.500% senior notes due June 15, 2035 | Senior notes        
Debt Instrument [Line Items]        
Debt, principal amount       $ 850,000,000
Stated interest rate   5.50%   5.50%
Principal debt issued   $ 850,000,000 $ 0  
5-Year Revolving Credit Facility | Line of credit | Revolving credit facility        
Debt Instrument [Line Items]        
Debt, term 5 years 5 years 5 years  
Maximum borrowing capacity   $ 3,000,000,000    
364-Day Revolving Credit Facility | Line of credit | Revolving credit facility        
Debt Instrument [Line Items]        
Debt, term 364 days 364 days 364 days  
Maximum borrowing capacity   $ 500,000,000    
Floating rate Term Loan Facility due January 2, 2026 | Line of credit        
Debt Instrument [Line Items]        
Principal debt issued   $ 500,000,000 $ 750,000,000  
Debt repayments $ 250,000,000      
Floating rate Term Loan Facility due January 2, 2026 | Line of credit | Unsecured debt        
Debt Instrument [Line Items]        
Debt, term   3 years    
Maximum borrowing capacity   $ 2,000,000,000