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Debt and Financing Activities - Commercial Paper Narrative (Details) - Commercial Paper - USD ($)	6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Mar. 31, 2024
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity	$ 4,000,000,000.0
Proceeds from issuance of commercial paper	6,900,000,000	$ 2,000,000,000.0
Repayments of commercial paper	6,900,000,000	$ 2,000,000,000.0
Commercial paper	$ 0		$ 0

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481544/470-10-50-6

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
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-Section S99
-Paragraph 1
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-Publisher FASB
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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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- Definition

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).

+ References

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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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