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Significant Accounting Policies - Receivables, Net (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Mar. 31, 2023
Accounting Policies [Abstract]    
Customer accounts $ 19,439 $ 17,160
Other 3,104 2,408
Total receivables 22,543 19,568
Allowances (921) (158)
Receivables, net $ 21,622 $ 19,410