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Capital Stock (Narrative - Equity) (Details) - shares shares in Millions	Mar. 31, 2023	Mar. 31, 2022
Class A Voting Common Shares
Class of Stock [Line Items]
Authorized common shares (in shares)	500.0	500.0
Class B Non-Voting Common Shares
Class of Stock [Line Items]
Authorized common shares (in shares)	500.0	500.0

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- 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

No definition available.

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- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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