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Shareholders' equity Share Repurchases (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 25, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 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 |  |  | 3,674,300 |  | 5,684,700 |  |
Cost of shares repurchased |  |  | $ 724 |  | $ 1,152 |  |
Repurchase authorization remaining at end of period |  |  | $ 0 |  | $ 0 |  |
July 2023 Stock Repurchase Plan |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  | $ 5,000 |
Number of shares repurchased |  | 2,254,236 |  | 3,474,357 |  |  |
Cost of shares repurchased |  | $ 570 |  | $ 886 |  |  |
Repurchase authorization remaining at end of period |  | $ 2,808 |  | $ 2,808 |  |  |
Subsequent Event [Member] | July 2023 Stock Repurchase Plan |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Number of shares repurchased | 175,465 |  |  |  |  |  |
Cost of shares repurchased | $ 45 |  |  |  |  |  |
Repurchase authorization remaining at end of period | $ 2,764 |  |  |  |  |  |

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