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Settlement Guarantee Management - Collateral (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Sep. 30, 2021
Settlement Guarantee Management [Abstract]    
Restricted cash and restricted cash equivalents $ 2,284 $ 2,260
Pledged securities at market value 273 254
Letters of credit 1,545 1,518
Guarantees 765 758
Total $ 4,867 $ 4,790