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Debt and Financing Activities - Commercial Paper (Details) - USD ($)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Debt Instrument [Line Items]
Commercial paper issuances	$ 11,200,000,000	$ 6,300,000,000	$ 21,400,000,000
Commercial paper repaid	11,200,000,000	6,300,000,000	$ 21,400,000,000
Total debt outstanding	5,879,000,000	7,148,000,000
Commercial Paper
Debt Instrument [Line Items]
Credit facility borrowing capacity (up to)	4,000,000,000
Total debt outstanding	$ 0	$ 0

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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