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Debt and Financing Activities - Commercial Paper Narrative (Details) - USD ($)	9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Mar. 31, 2024
Line of Credit Facility [Line Items]
Weighted average interest rate (as a percent)	4.75%
Commercial Paper
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity	$ 4,000,000,000.0
Proceeds from issuance of commercial paper	11,400,000,000	$ 4,800,000,000
Repayments of commercial paper	9,000,000,000.0	$ 4,600,000,000
Commercial paper	$ 2,400,000,000		$ 0

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Weighted average interest rate of debt outstanding.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
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-Publisher FASB
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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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