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Summary of Significant Accounting Policies Depreciation (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Property, Plant and Equipment [Line Items]        
Depreciation expense $ 450 $ 481 $ 902 $ 947