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Financial Instruments - Loans and Other Receivables Carried at Amortized Cost (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Mar. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]    
Allowance for current expected credit losses $ (19) $ (22)
Loans and other receivables carried at amortized cost, net 9 21
Loans receivable    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Loan and other receivables carried at amortized cost 22 25
Other receivables    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Loan and other receivables carried at amortized cost $ 6 $ 18