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Settlement Guarantee Management (Tables)
 3 Months Ended
Dec. 31, 2023
Settlement Guarantee Management [Abstract]  
Schedule of Customer Collateral The Company held the following collateral to manage settlement exposure:
December 31,
2023		September 30,
2023
 (in millions)
Restricted cash
$3,164 $3,005 
Pledged securities
504 411 
Letters of credit1,779 1,738 
Guarantees1,054 1,047 
Total$6,501 $6,201