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Hedging Activities - Narrative (Details) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 CAD ($) | Jun. 30, 2025 USD ($) | Mar. 31, 2025 CAD ($)
Derivative [Line Items] |  |  |  |  |
Other comprehensive income (loss), cash flows hedge, gain (loss) reclassification, before tax | $ 0 | $ 0 |  |  |
Currency swap | Cash Flow Hedges | Derivatives designated for hedge accounting |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Other comprehensive income (loss), cash flows hedge, gain (loss) reclassification, before tax | 5,000,000 | $ 0 |  |  |
Floating interest rate swaps | Cash Flow Hedges | Derivatives designated for hedge accounting |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amounts of derivative |  |  |  | $ 1,400,000,000 |
Derivative, notional amount, entered into during period | $ 550,000,000 |  |  |  |
CAD | Currency swap | Net Investment Hedging | Derivatives designated for hedge accounting |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amounts of derivative |  |  | $ 6,500 |  | $ 6,500

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