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Shareholders' Equity - Comprehensive Capital Plan (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jul. 31, 2021
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |
Common shares repurchased, value |  |  |  |  | $ 38,000,000 | $ 0 | $ 559,000,000 |
Cash dividends declared on Common Shares (in dollars per share) | $ 0.205 | $ 0.205 | $ 0.205 | $ 0.205 | $ 0.82 | $ 0.79 | $ 0.75 |
2021 Repurchase Authorization |  |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |
Authorized amount of share repurchases |  |  |  |  |  |  |  | $ 1,500,000,000
Open Market Share Repurchases |  |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |
Common shares repurchased, value |  |  |  |  | $ 38,000,000 |  |  |
Equity Compensation Programs |  |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |
Common shares repurchased, value |  |  |  |  | $ 34,000,000 |  |  |

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