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Shareholders' equity Share Repurchases (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Jul. 01, 2023 | May 19, 2022
May 2022 Stock Repurchase Plan |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  | $ 2,500
Number of shares repurchased |  |  |  | 8,634,600 |  |
Cost of shares repurchased |  |  |  | $ 1,758 |  |
Repurchase authorization remaining at end of period |  | $ 4,398 |  | 4,398 |  |
July 2023 Stock Repurchase Plan |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  | $ 5,000 |
Number of shares repurchased | 1,441,607 | 2,949,900 | 4,915,964 |  |  |
Cost of shares repurchased | $ 413 | $ 606 | $ 1,299 |  |  |
Repurchase authorization remaining at end of period | $ 2,400 | $ 4,398 | $ 2,400 | $ 4,398 |  |

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