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Capital Stock (Shares Reserved for Future Issuance) (Details) - shares shares in Millions	Mar. 31, 2024	Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)	49.5	50.2
Stock options and SARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)	20.7	24.8
Restricted Share Units (RSUs) and Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)	13.4	14.0
Common shares available for future issuance under plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)	15.4	11.4

X

- Definition

Aggregate number of common shares reserved for future issuance.

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