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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, $ in Millions | Sep. 30, 2024 CAD ($) | Sep. 30, 2024 GBP (£) | Sep. 30, 2024 EUR (€) | Sep. 30, 2024 USD ($) | Jun. 30, 2024 CAD ($) | Mar. 31, 2024 CAD ($) | Mar. 31, 2024 GBP (£) | Mar. 31, 2024 EUR (€) | Mar. 31, 2024 USD ($) | Jun. 15, 2023 USD ($) | Mar. 31, 2023 USD ($)
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Cross-currency swaps | Net Investment Hedges | CAD |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional | $ 2,500 |  |  |  | $ 2,500 | $ 1,500 |  |  |  |  |
Cross-currency swaps | Fair Value Hedges | GBP |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional | £ |  | £ 450 |  |  |  |  | £ 450 |  |  |  |
Cross-currency swaps | Fair Value Hedges | EUR |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional | € |  |  | € 1,100 |  |  |  |  | € 1,100 |  |  |
Floating interest rate swaps | Fair Value Hedges |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional |  |  |  | $ 1,300 |  |  |  |  |  |  | $ 1,300
Floating interest rate swaps | Fair Value Hedges | USD |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional |  |  |  | $ 750 |  |  |  |  | $ 1,250 |  |
Floating interest rate swaps | Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional |  |  |  |  |  |  |  |  |  | $ 500 |
Foreign currency forwards | Cash Flow Hedges | GBP |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional | £ |  | £ 27 |  |  |  |  | £ 39 |  |  |  |

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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 -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A + Details
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