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Revenue Recognition - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Disaggregation of Revenue [Line Items]        
Contract with customer, liability, revenue recognized $ 372 $ 319 $ 1,261 $ 1,165
Revenue, remaining performance obligation, amount 21,200   21,200  
Capitalized contract cost, amortization 77 61 134 122
Capitalized contract cost, impairment loss $ 0 $ 0 $ 0 $ 0
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]: 2024-04-01        
Disaggregation of Revenue [Line Items]        
Revenue, remaining performance obligation, percentage 66.00%   66.00%  
Revenue, remaining performance obligation, expected timing of satisfaction, period 2 years   2 years