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Shareholders' equity Share Repurchases (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Jul. 01, 2023 | May 19, 2022 | Jul. 19, 2021
July 2021 Stock Repurchase Plan |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  | $ 5,000
Number of shares repurchased |  |  | 5,476,300 |  | 10,346,200 |  |  |
Cost of shares repurchased |  |  | $ 1,129 |  | $ 2,130 |  |  |
Repurchase authorization remaining at end of period (1) |  |  | $ 2,500 |  | $ 2,500 |  |  |
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 (1) | [1] | 0 |  | 0 |  |  |  |
CB_Stock Repurchase Program_Authorized Repurchase_Expired Amount |  | $ 474 |  | $ 474 |  |  |  |
July 2023 Stock Repurchase Plan |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  | $ 5,000 |  |
[1] | As of June 30, 2023, $474 million expired under the May 2022 $2.5 billion share repurchase authorization.

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