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Settlement Guarantee Management - Collateral (Detail) - USD ($)
$ in Millions
Mar. 31, 2020
Sep. 30, 2019
Settlement Guarantee Management [Abstract]    
Restricted cash and restricted cash equivalents $ 1,698 $ 1,648
Pledged securities at market value 235 259
Letters of credit 1,300 1,293
Guarantees 508 477
Total $ 3,741 $ 3,677