Trust Pass-Through Securities - Additional Information (Detail) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Disclosure of trust pass-through securities [line items] | ||
| Trust pass-through securities, extension period description | The trust pass-through securities include provisions for deferring distributions for extension periods up to 10 consecutive semi-annual periods. | |
| USD 190 million [member] | ||
| Disclosure of trust pass-through securities [line items] | ||
| Subordinated notes issued | $ 225 | $ 225 |
| USD 225 million [member] | ||
| Disclosure of trust pass-through securities [line items] | ||
| Subordinated notes issued | $ 190 | $ 190 |