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Settlement Guarantee Management (Tables)
 9 Months Ended
Jun. 30, 2023
Settlement Guarantee Management [Abstract]  
Schedule of Customer Collateral The Company held the following collateral to manage settlement exposure:
June 30,
2023		September 30,
2022
 (in millions)
Restricted cash and restricted cash equivalents$2,907 $2,342 
Pledged securities at market value408 213 
Letters of credit1,717 1,582 
Guarantees1,094 950 
Total$6,126 $5,087