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Shareholders' equity Share Repurchases (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 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 |  |  |  | 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 | 8,634,600 | 14,022,728 |  |  |
Cost of shares repurchased |  | $ 685 | $ 1,758 | $ 2,815 |  |  |
Repurchase authorization remaining at end of period |  | $ 1,816 |  | $ 1,816 |  |  |
July 2023 Stock Repurchase Plan |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  | $ 5,000 |  |
Number of shares repurchased | 2,949,900 |  | 8,634,600 |  |  |  |
Cost of shares repurchased | $ 606 |  | $ 1,758 |  |  |  |
Repurchase authorization remaining at end of period | $ 4,398 |  | $ 4,398 |  |  |  |

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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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