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Summary of Significant Accounting Policies Cash, Cash Equivalents, and Restricted Cash (Tables)
9 Months Ended
Jun. 30, 2022
Cash and Cash Equivalents [Abstract]  
Schedule of Cash and Cash Equivalents
Cash, Cash Equivalents, and Restricted Cash
(in millions)
 At June 30, 2022At September 30, 2021
Cash and cash equivalents$501 $499 
Restricted cash and cash equivalents included in Other long-term assets20 19 
Total cash, cash equivalents, and restricted cash$521 $518