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Settlement Guarantee Management - Collateral (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Sep. 30, 2019
Settlement Guarantee Management [Abstract]    
Restricted cash and restricted cash equivalents $ 1,759 $ 1,648
Pledged securities at market value 281 259
Letters of credit 1,273 1,293
Guarantees 704 477
Total $ 4,017 $ 3,677