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Settlement Guarantee Management (Tables)
 6 Months Ended
Mar. 31, 2022
Settlement Guarantee Management [Abstract]  
Schedule of Customer Collateral The Company held the following collateral to manage settlement exposure:
March 31,
2022		September 30,
2021
 (in millions)
Restricted cash and restricted cash equivalents$2,309 $2,260 
Pledged securities at market value270 254 
Letters of credit1,604 1,518 
Guarantees793 758 
Total$4,976 $4,790