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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 ($) | Mar. 31, 2022 GBP (£) | Mar. 31, 2022 USD ($)
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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

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- 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 + Details
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