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Shareholders' equity Repurchase of Common Shares (Details) - USD ($) $ in Millions | 2 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 23, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Number of shares repurchased |  | 14,925,028 | 27,644,500 | 3,584,150
Nov 2019 Stock Repurchase Plan [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Number of shares repurchased |  |  |  | 3,584,150
Common Shares repurchased |  |  |  | $ 516
July 2021 Stock Repurchase Plan |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Number of shares repurchased |  |  | 27,644,500 |
Common Shares repurchased |  |  | $ 4,861 |
2022 Stock Repurchase Plan |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Number of shares repurchased |  | 14,925,028 |  |
Common Shares repurchased |  | $ 3,014 |  |
Subsequent Event [Member] | 2022 Stock Repurchase Plan |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Number of shares repurchased | 1,633,300 |  |  |
Common Shares repurchased | $ 347 |  |  |

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