v3.25.2
Revenue Recognition - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disaggregation of Revenue [Line Items]        
Contract with customer, liability, revenue recognized $ 279 $ 267 $ 1,550 $ 1,475
Revenue, remaining performance obligation, amount 22,400   22,400  
Capitalized contract cost, amortization $ 104 $ 84 $ 279 $ 218
Minimum        
Disaggregation of Revenue [Line Items]        
Contract term     25 years  
Maximum        
Disaggregation of Revenue [Line Items]        
Contract term     35 years  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-01        
Disaggregation of Revenue [Line Items]        
Revenue, remaining performance obligation, percentage 63.00%   63.00%  
Revenue, remaining performance obligation, expected timing of satisfaction, period 2 years   2 years