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Summary of Significant Accounting Policies Cash, Cash Equivalents, and Restricted Cash (Tables)
6 Months Ended
Mar. 31, 2024
Cash and Cash Equivalents [Abstract]  
Schedule of Cash and Cash Equivalents
Cash, Cash Equivalents, and Restricted Cash
(in millions)
 At March 31, 2024At September 30, 2023
Cash and cash equivalents$508 $501 
Restricted cash and cash equivalents included in Other long-term assets20 20 
Total cash, cash equivalents, and restricted cash$528 $521