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Receivables - Allowance for Doubtful Accounts (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 35 $ 47  
Provisions for losses on accounts receivable 12 0 $ (1)
Other adjustments to allowance and write-offs (15) (12)  
Ending balance $ 32 $ 35 $ 47