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Revenue Recognition - Performance Obligations and Costs to Obtain or Fulfill a Contract (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Sep. 30, 2021
Disaggregation of Revenue [Line Items]          
Revenue, Remaining Performance Obligation, Amount $ 17,300,000,000   $ 17,300,000,000    
Remaining Performance Obligations Expected as Revenue Over the Next Two Years 60.00%   60.00%    
Capitalized Contract Cost, Amortization $ 47,000,000 $ 47,000,000 $ 97,000,000 $ 88,000,000  
Capitalized Contract Cost, Impairment Loss     0 $ 0  
Capitalized Contract Cost, Net, Current 150,000,000   150,000,000   $ 149,000,000
Capitalized Contract Cost, Net, Noncurrent 116,000,000   116,000,000   117,000,000
Capitalized Contract Cost, Net $ 266,000,000   $ 266,000,000   $ 266,000,000