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Settlement Guarantee Management - Collateral (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Sep. 30, 2020
Settlement Guarantee Management [Abstract]    
Restricted cash and restricted cash equivalents $ 1,993 $ 1,850
Pledged securities at market value 282 228
Letters of credit 1,377 1,306
Guarantees 714 717
Total $ 4,366 $ 4,101