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Hedging Activities - Schedule of Notional Amounts of Outstanding Derivatives (Details) - Derivatives designated for hedge accounting € in Millions, £ in Millions, $ in Millions, $ in Millions | Jun. 30, 2025 CAD ($) | Jun. 30, 2025 GBP (£) | Jun. 30, 2025 EUR (€) | Jun. 30, 2025 USD ($) | Mar. 31, 2025 CAD ($) | Mar. 31, 2025 GBP (£) | Mar. 31, 2025 EUR (€) | Mar. 31, 2025 USD ($)
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Cross-currency swaps | Net Investment Hedges | CAD |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |
Notional | $ 6,500 |  |  |  | $ 6,500 |  |  |
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 | USD |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |
Notional |  |  |  | $ 750 |  |  |  | $ 750
Floating interest rate swaps | Cash Flow Hedges |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |
Notional |  |  |  | 1,400 |  |  |  |
Floating interest rate swaps | Cash Flow Hedges | USD |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |
Notional |  |  |  | $ 0 |  |  |  | $ 850
Interest rate swap locks, Foreign currency forwards and Other | Cash Flow Hedges | GBP |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |
Notional | £ |  | £ 2 |  |  |  | £ 11 |  |

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