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Summary of Significant Accounting Policies Cash, Cash Equivalents, and Restricted Cash (Tables)
3 Months Ended
Dec. 31, 2023
Cash and Cash Equivalents [Abstract]  
Schedule of Cash and Cash Equivalents
Cash, Cash Equivalents, and Restricted Cash
(in millions)
 At December 31, 2023At September 30, 2023
Cash and cash equivalents$498 $501 
Restricted cash and cash equivalents included in Other long-term assets20 20 
Total cash, cash equivalents, and restricted cash$518 $521