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Stock-based compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Amount by which the pool of available shares will be reduced for each stock option granted (in shares) |  | 1 |  |
The amount of common stock available under the plan for future grants and/or issuances (in shares) |  | 59,000,000 |  |
Total unrecognized compensation cost related to nonvested awards |  | $ 510 |  |
Weighted average number of years over which compensation cost related to nonvested awards is expected to be recognized (in years) |  | 1 year 9 months 18 days |  |
Period over which the grants of equity instruments vest (in years) |  | 3 years |  |
Number of common shares issued for each performance unit earned (in shares) |  | 1 | 1 | 1
RSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
The number of shares by which the pool of available shares will be reduced for other types of awards granted (in shares) |  | 1.9 |  |
Number of shares added back for tax withholding on full value awards (in shares) |  | 1.9 |  |
Awards accelerated and settled | $ 42 |  |  |
Weighted average grant date fair value, granted (in usd per share) |  | $ 301.36 | $ 237.70 | $ 234.47
Total fair value of units that vested during the year |  | $ 401 | $ 309 | $ 192
Units outstanding (in shares) | 3,900,000 | 3,500,000 | 3,900,000 |
Weighted-average grant date fair value (in usd per share) | $ 246.43 | $ 265.07 | $ 246.43 |
Units granted (in shares) |  | 1,500,000 |  |
Units, forfeited (in shares) |  | 300,000 |  |
Weighted average grant date fair value, forfeited (in usd per share) |  | $ 267.28 |  |
Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Expiration period of stock options from date of grant (in years) |  | 10 years |  |
Total intrinsic value of stock options exercised during the year |  | $ 70 | $ 33 | 67
Actual tax benefits realized from tax deductions from option exercises |  | $ 15 | $ 7 | $ 14
Performance units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
The number of shares by which the pool of available shares will be reduced for other types of awards granted (in shares) |  | 1.9 |  |
Number of shares added back for tax withholding on full value awards (in shares) |  | 1.9 |  |
Weighted average grant date fair value, granted (in usd per share) |  | $ 321.61 | $ 252.49 | $ 247.48
Total fair value of units that vested during the year |  | $ 182 | $ 109 | $ 150
Total unrecognized compensation cost related to nonvested awards |  | $ 87 |  |
Weighted average number of years over which compensation cost related to nonvested awards is expected to be recognized (in years) |  | 1 year |  |
Units outstanding (in shares) | 1,700,000 | 1,400,000 | 1,700,000 |
Weighted-average grant date fair value (in usd per share) | $ 251.41 | $ 263.86 | $ 251.41 |
Units granted (in shares) |  | 300,000 |  |
Units, forfeited (in shares) |  | 100,000 |  |
Weighted average grant date fair value, forfeited (in usd per share) |  | $ 261.03 |  |

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