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Debt and Financing Activities - Commercial Paper Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Mar. 31, 2022
Debt Instrument [Line Items]      
Weighted average interest rate (percent) 4.73%    
Commercial Paper      
Debt Instrument [Line Items]      
Outstanding notes (up to) $ 4,000    
Proceeds from issuance of commercial paper 1,100 $ 3,600  
Repayments of commercial paper (483) $ (3,300)  
Commercial paper $ 617   $ 0