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Shareholders' Equity - Comprehensive Capital Plan and Scotiabank Investment (Details) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 27, 2024 | Aug. 30, 2024 | Aug. 12, 2024 | Dec. 31, 2025 | Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Mar. 13, 2025
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount authorized to be repurchased |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000.0
Common shares repurchased, value |  |  |  | $ 200,000,000 |  |  |  | $ 200,000,000 |  | $ 38,000,000 |
Stock repurchased during period, value |  |  |  |  |  |  |  | $ 35,000,000 | $ 28,000,000 | $ 34,000,000 |
Cash dividends declared on Common Shares (in dollars per share) |  |  |  | $ 0.205 | $ 0.205 | $ 0.205 | $ 0.205 | $ 0.82 | $ 0.82 | $ 0.82 |
Net proceeds from Scotiabank investment |  |  |  |  |  |  |  | $ 0 | $ 2,771,000,000 | $ 0 |
Scotiabank Investment Agreement |  |  |  |  |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common shares repurchased, value |  |  |  | $ 17,000,000 |  |  |  |  |  |  |
Investments |  |  | $ 2,800,000,000 |  |  |  |  |  |  |  |
Sale of stock, percentage of ownership after transaction | 14.90% | 4.90% | 14.90% |  |  |  |  |  |  |  |
Fixed price per share (in dollars per share) |  |  | $ 17.17 |  |  |  |  |  |  |  |
Initial purchase of common shares (in shares) | 115,042,316 | 47,829,359 |  |  |  |  |  |  |  |  |
Net proceeds from Scotiabank investment | $ 2,000,000,000.0 | $ 821,000,000 |  |  |  |  |  |  |  |  |
Proceeds from issuance costs | $ 16,000,000 | $ 10,000,000 |  |  |  |  |  |  |  |  |

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