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v3.24.0.1

Shareholders' equity (Details) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Mar. 02, 2023 USD ($) | Dec. 31, 2023 USD ($) vote $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) shares
Class of Stock [Line Items] |  |  |  |
Number of votes per share of common stock | vote |  | 1 |  |
Dividends, preferred stock | $ |  | $ 1 | $ 1 | $ 1
Share buyback program, authorized amount | $ | $ 3,000 |  |  |
Share buyback program, term | 12 months |  |  |
Common stock repurchased (in shares) |  | 54,900,928 | 29,755,861 |
Common stock repurchased, percentage of issued capital |  | 7.47% | 3.96% |
Common stock repurchased, average price (in usd per share) | $ / shares |  | $ 54.92 | $ 39.22 |
Common stock cancelled (in shares) |  | 17,620,740 | 22,000,000 |
Common stock cancelled, percentage of issued capital |  | 2.40% | 2.92% |
Treasury stock (in shares) |  | 42,419,281 | 7,712,885 |
Treasury stock, percentage of common stock issued |  | 5.78% | 1.03% |
Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Repurchases of common shares (in shares) |  | 17,600,000 |  | 795,100,000
Common stock cancelled (in shares) |  |  | 22,000,000.0 | 21,000,000.0
5% Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividend rate percentage |  | 5.00% |  |
Preferred stock issued as a percentage of total issued share capital |  | 0.03% | 0.03% |
7% Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividend rate percentage |  | 7.00% |  |
Preferred stock issued as a percentage of total issued share capital |  | 0.47% | 0.45% |

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