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Stock-based compensation - Components of Stock-based Compensation Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Components of stock-based compensation expense [Abstract] |  |  |
Total stock-based compensation expense, pretax | $ 473 | $ 401 | $ 341
Tax benefit from stock-based compensation expense | (102) | (86) | (74)
Total stock-based compensation expense, net of tax | 371 | 315 | 267
RSUs |  |  |
Components of stock-based compensation expense [Abstract] |  |  |
Total stock-based compensation expense, pretax | 309 | 227 | 183
Performance units |  |  |
Components of stock-based compensation expense [Abstract] |  |  |
Total stock-based compensation expense, pretax | 121 | 132 | 121
Stock options |  |  |
Components of stock-based compensation expense [Abstract] |  |  |
Total stock-based compensation expense, pretax | $ 43 | $ 42 | $ 37

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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