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Shareholders' Equity - Changes in Class of Shares (Details) - shares	3 Months Ended				6 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2025
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, common stock (in shares)		577,996,915			577,996,915
Beginning balance, common stock held in treasury (in shares)		39,292,311			39,292,311
Beginning balance, preferred stock shares issued (in shares)		1,485,000			1,485,000
Repurchase of common stock (shares)	0				0
Ending balance, common stock (in shares)	578,423,869				578,423,869
Ending balance, common stock held in treasury (in shares)	37,977,550				37,977,550
Ending balance, preferred stock shares issued (in shares)	1,485,000				1,485,000
Series A Preferred Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, preferred stock shares issued (in shares)	1,500,000	1,500,000			1,500,000
Ending balance, preferred stock shares issued (in shares)	1,500,000	1,500,000			1,500,000
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, common stock (in shares)	578,400,000	578,000,000.0	577,800,000	577,800,000	578,000,000.0
Common stock issued for acquisition (in shares)		400,000
Common stock issued under employee equity incentive plans (shares)	900,000	700,000	900,000	800,000
Common stock withheld for tax withholdings on employee equity awards (shares)	(200,000)	(100,000)	(200,000)	(200,000)
Treasury stock used for new issuances (shares)	(700,000)	(600,000)	(700,000)	(600,000)
Ending balance, common stock (in shares)	578,400,000	578,400,000	577,800,000	577,800,000	578,400,000
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, common stock held in treasury (in shares)	38,700,000	39,300,000	41,300,000	41,100,000	39,300,000
Repurchase of common stock (shares)			200,000	800,000
Treasury stock used for new issuances (shares)	(700,000)	(600,000)	(700,000)	(600,000)
Ending balance, common stock held in treasury (in shares)	38,000,000.0	38,700,000	40,800,000	41,300,000	38,000,000.0

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Number of shares issued for nonredeemable preferred shares and preferred shares redeemable solely at option of issuer. Includes, but is not limited to, preferred shares issued, repurchased, and held as treasury shares. Excludes preferred shares classified as debt.

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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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Number of shares of stock issued during the period pursuant to acquisitions.

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