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Shareholders' Equity - Preferred shares (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 1 Months Ended | 4 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 01, 2018 | Sep. 30, 2021 | Jun. 30, 2021 | Nov. 30, 2017 | Aug. 31, 2017 | Nov. 30, 2017 | Dec. 31, 2023 | Sep. 30, 2022
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred shares, par value per share |  |  |  |  |  |  | $ 0.01 |
Series C Preferred Shares |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred shares, dividend rate (as a percent) | 6.75% |  |  |  |  |  |  |
Series E preferred shares |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred shares, dividend rate (as a percent) |  | 5.25% |  |  |  |  |  |
Preferred shares, redemption price per share |  |  |  |  |  |  |  | $ 25
Series F Preferred Shares |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred shares issued |  |  |  | $ 100 | $ 230 | $ 330 |  |
Preferred shares, dividend rate (as a percent) |  |  |  |  |  | 5.45% |  |
Preferred shares, par value per share |  |  |  | $ 0.01 |  | $ 0.01 |  |
Liquidation preference per share |  |  |  | 25,000 |  | 25,000 |  |
Preferred shares, redemption price per share |  |  |  | $ 25,000 |  | $ 25,000 |  |
Series F depositary share equivalent |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preference shares, number of shares issued |  |  |  | 13.2 |  | 13.2 |  |
Proportionate interest of preference shares, per depositary share |  |  |  | 0.10% |  | 0.10% |  |
Liquidation preference per share |  |  |  | $ 25 |  | $ 25 |  |
Preferred shares, redemption price per share |  |  |  | $ 25 |  | $ 25 |  |
Series G Preferred Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred shares issued |  |  | $ 500 |  |  |  |  |
Preferred shares, dividend rate (as a percent) |  |  | 4.55% |  |  |  |  |
Preferred shares, par value per share |  |  | $ 0.01 |  |  |  |  |
Liquidation preference per share |  |  | 25,000 |  |  |  |  |
Preferred shares, redemption price per share |  |  | $ 25,000 |  |  |  |  |
Series G depositary share equivalent |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preference shares, number of shares issued |  |  | 20.0 |  |  |  |  |
Proportionate interest of preference shares, per depositary share |  |  | 0.10% |  |  |  |  |
Liquidation preference per share |  |  | $ 25 |  |  |  |  |
Preferred shares, redemption price per share |  |  | $ 25 |  |  |  |  |

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