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Debt and Financing Activities - Commercial Paper (Details) - Commercial Paper - USD ($)	9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Mar. 31, 2021
Debt Instrument [Line Items]
Outstanding notes (up to)	$ 4,000,000,000
Proceeds from issuance of commercial paper	3,600,000,000	$ 5,500,000,000
Repayments of commercial paper	3,300,000,000	$ 5,300,000,000
Commercial paper	$ 372,000,000		$ 0
Weighted average interest rate (percent)	0.29%

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Weighted average interest rate of debt outstanding.

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Carrying value as of the balance sheet date of the current portion of long-term unsecured obligations issued by corporations and other borrowers to investors (with maturities initially due after one year or beyond the operating cycle if longer).

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The cash inflow from borrowing by issuing commercial paper.

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The cash outflow due to repaying amounts borrowed by issuing commercial paper.

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