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Settlement Guarantee Management - Collateral (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Sep. 30, 2018
Settlement Guarantee Management [Abstract]    
Cash equivalents $ 1,668 $ 1,708
Pledged securities at market value 294 192
Letters of credit 1,447 1,382
Guarantees 582 860
Total $ 3,991 $ 4,142