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Shareholders' equity Repurchase of Common Shares (Details) - USD ($) $ in Millions | 2 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 22, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | May 19, 2022 | Jul. 19, 2021 | Feb. 01, 2021 | Nov. 19, 2020
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares repurchased |  | 11,825,600 | 14,925,028 | 27,644,500 |  |  |  |
Nov 2020 Stock Repurchase Plan [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  |  |  |  |  |  | $ 2,500 | $ 1,500
2021 Stock Repurchase Plan |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares repurchased |  |  |  | 27,644,500 |  |  |  |
Common Shares repurchased |  |  |  | $ 4,861 |  |  |  |
Stock repurchase program authorized amount |  |  |  |  |  | $ 5,000 |  |
2022 Stock Repurchase Plan |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares repurchased |  |  | 14,925,028 |  |  |  |  |
Common Shares repurchased |  |  | $ 3,014 |  |  |  |  |
Stock repurchase program authorized amount |  |  |  |  | $ 2,500 |  |  |
July 2023 Stock Repurchase Plan |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares repurchased |  | 11,825,600 |  |  |  |  |  |
Common Shares repurchased |  | $ 2,478 |  |  |  |  |  |
Stock repurchase program authorized amount |  |  |  |  | $ 5,000 |  |  |
Subsequent Event [Member] | July 2023 Stock Repurchase Plan |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares repurchased | 269,450 |  |  |  |  |  |  |
Common Shares repurchased | $ 67 |  |  |  |  |  |  |

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