Revenue Recognition - Narrative (Details) - USD ($)	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Contract with customer, liability, revenue recognized	$ 846,000,000	$ 751,000,000
Capitalized contract cost, amortization	61,000,000	50,000,000
Capitalized contract cost, impairment loss	$ 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]: 2023-01-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, amount	$ 18,400,000,000
Revenue, remaining performance obligation, percentage	65.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period	2 years