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Shareholders' equity Share Repurchases (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | May 19, 2022 | Jul. 19, 2021 | Feb. 01, 2021 | Nov. 19, 2020
Nov 2019 Stock Repurchase Plan [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares repurchased |  |  |  | 22,877,400 |  |  |  |
Cost of shares repurchased |  |  |  | $ 3,956 |  |  |  |
Repurchase authorization remaining at end of period |  | $ 3,551 |  | 3,551 |  |  |  |
Nov 2020 Stock Repurchase Plan |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  | $ 2,500 | $ 1,500
Number of shares repurchased |  | 8,412,000 |  |  |  |  |  |
Cost of shares repurchased |  | $ 1,516 |  |  |  |  |  |
Repurchase authorization remaining at end of period |  | $ 3,551 |  | $ 3,551 |  |  |  |
CB_Increase(Decrease)StockRepurchaseProgramAuthorizedAmount |  |  |  |  |  |  | $ 1,000 |
July 2021 Stock Repurchase Plan |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  | $ 5,000 |  |
Number of shares repurchased |  |  | 14,022,728 |  |  |  |  |
Cost of shares repurchased |  |  | $ 2,815 |  |  |  |  |
May 2022 Stock Repurchase Plan |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  | $ 2,500 |  |  |
Number of shares repurchased | 3,676,528 |  |  |  |  |  |  |
Cost of shares repurchased | $ 685 |  |  |  |  |  |  |
Repurchase authorization remaining at end of period | $ 1,816 |  | $ 1,816 |  |  |  |  |

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