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Settlement Guarantee Management - Collateral (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Sep. 30, 2020
Settlement Guarantee Management [Abstract]    
Restricted cash and restricted cash equivalents $ 2,221 $ 1,850
Pledged securities at market value 253 228
Letters of credit 1,402 1,306
Guarantees 729 717
Total $ 4,605 $ 4,101