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Settlement Guarantee Management (Tables)
 6 Months Ended
Mar. 31, 2023
Settlement Guarantee Management [Abstract]  
Schedule of Customer Collateral The Company held the following collateral to manage settlement exposure:
March 31,
2023		September 30,
2022
 (in millions)
Restricted cash and restricted cash equivalents$2,739 $2,342 
Pledged securities at market value294 213 
Letters of credit1,638 1,582 
Guarantees1,068 950 
Total$5,739 $5,087