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Debt and Financing Activities - Commercial Paper (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Debt Instrument [Line Items]      
Commercial paper issuances $ 9,200 $ 15,100 $ 20,000
Commercial paper repaid 9,200 15,100 $ 20,000
Commercial paper notes outstanding 6,526 5,654  
Commercial Paper      
Debt Instrument [Line Items]      
Credit facility borrowing capacity 5,000    
Commercial paper notes outstanding $ 0 $ 0