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Hedging Activities - Schedule of Notional Amounts of Outstanding Derivative Positions (Details) - Derivatives designated for hedge accounting £ in Millions, $ in Millions, $ in Millions	Jun. 30, 2022 CAD ($)	Jun. 30, 2022 GBP (£)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 CAD ($)	Mar. 31, 2022 GBP (£)	Mar. 31, 2022 USD ($)
Fair Value Hedging | Derivatives designated as net investment hedges: | GBP
Derivatives, Fair Value [Line Items]
Notional | £		£ 450			£ 450
Derivatives designated as net investment hedges: | Net Investment Hedging | CAD
Derivatives, Fair Value [Line Items]
Notional	$ 500			$ 500
Derivatives designated as net investment hedges: | Cash Flow Hedging | USD
Derivatives, Fair Value [Line Items]
Notional	$ 1,678			$ 1,678
Floating interest rate swaps (4) | Fair Value Hedging | USD
Derivatives, Fair Value [Line Items]
Notional			$ 180			$ 0
Fixed interest rate swaps | Cash Flow Hedging | USD
Derivatives, Fair Value [Line Items]
Notional			$ 500			$ 500

X

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

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+ References

No definition available.

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