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Short-Term Borrowings and Long-Term Debt (Details) - USD ($) $ in Millions	Jul. 31, 2024	Mar. 31, 2024
Debt Instrument [Line Items]
Par Value	$ 12,000	$ 6,000
4.600% notes due April 2027
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.60%
Par Value		$ 500
4.700% notes due April 2029
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.70%
Par Value		$ 400
4.900% notes due April 2031
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.90%
Par Value		$ 1,000
5.000% notes due April 2034
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.00%
Par Value		$ 1,250
5.375% Notes due April 2054
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.375%
Par Value		$ 1,750
5.500% Notes due April 2064
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.50%
Par Value		$ 1,100
Floating rate notes due July 2026
Debt Instrument [Line Items]
Par Value	$ 500
4.750% notes due July 2026
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.75%
Par Value	$ 650
4.800% notes due January 2030
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.80%
Par Value	$ 1,250
4.950% notes due January 2032
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.95%
Par Value	$ 1,500
5.150% notes due July 2034
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.15%
Par Value	$ 2,000
5.500% notes due July 2044
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.50%
Par Value	$ 1,500
5.625% notes due July 2054
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.625%
Par Value	$ 2,750
5.750% notes due July 2064
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.75%
Par Value	$ 1,850

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Face (par) amount of debt instrument at time of issuance.

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