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Hedging Activities - Schedule of Foreign Currency Gains and (Losses) from Non-Derivative Instruments (Details) - Derivatives designated for hedge accounting: € in Millions, £ in Millions, $ in Millions, $ in Millions | Mar. 31, 2026 CAD ($) | Mar. 31, 2026 GBP (£) | Mar. 31, 2026 EUR (€) | Mar. 31, 2026 USD ($) | Jan. 31, 2026 USD ($) | Jun. 30, 2025 USD ($) | Mar. 31, 2025 CAD ($) | Mar. 31, 2025 GBP (£) | Mar. 31, 2025 EUR (€) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 GBP (£)
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Interest rate swaps (non-current) | Fair Value Hedges |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional |  |  |  | $ 1,300 |  |  |  |  |  |  |
Interest rate swaps (non-current) | Cash Flow Hedging |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional |  |  |  |  |  | $ 1,400 |  |  |  |  |
CAD | Cross-currency swaps | Net Investment Hedging |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional | $ 6,500 |  |  |  |  |  | $ 6,500 |  |  |  |
GBP | Cross-currency swaps | Fair Value Hedges |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional | £ |  | £ 450 |  |  |  |  |  | £ 450 |  |  |
GBP | Foreign currency forwards | Cash Flow Hedging |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional | £ |  | £ 0 |  |  |  |  |  | £ 11 |  |  | £ 45
EUR | Cross-currency swaps | Fair Value Hedges |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional | € |  |  | € 500 |  |  |  |  |  | € 1,100 |  |
USD | Interest rate swaps (non-current) | Fair Value Hedges |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional |  |  |  | 750 |  |  |  |  |  | $ 750 |
USD | Interest rate swaps (non-current) | Cash Flow Hedging |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional |  |  |  | $ 0 |  |  |  |  |  | $ 850 |
USD | Foreign currency forwards | Cash Flow Hedging |  |  |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional |  |  |  |  | $ 791 |  |  |  |  |  |

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