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Summary of Significant Accounting Policies Depreciation (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Property, Plant and Equipment [Line Items]        
Depreciation expense $ 463 $ 482 $ 1,400 $ 1,400