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Stock-based compensation (Textual) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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 | 1 |  |
The amount of common stock available under the plan for future grants and/or issuances (in shares) | 15,000,000 |  |
Description of vesting of restricted stock units and stock options | RSUs and stock options generally vest in equal amounts on the second, third and fourth anniversaries of the grant date. |  |
Total unrecognized compensation cost related to nonvested awards | $ 362 |  |
Weighted average number of years over which compensation cost related to nonvested awards is expected to be recognized | 1 year 8 months 12 days |  |
Period over which the grants of equity instruments vest | 3 years |  |
Number of common shares issued for each performance unit earned | 1 | 1 | 1
RSUs [Member] |  |  |
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 | 1.9 |  |
Number of shares added back for tax withholding on full value awards | 1.9 |  |
Weighted average grant date fair value, granted (in usd per share) | $ 234.47 | $ 233.10 | $ 235.63
Total fair value of units that vested during the year | $ 192 | $ 166 | $ 161
Units outstanding (in shares) | 2,800,000 | 3,000,000.0 |
Weighted-average grant date fair value | $ 228.71 | $ 217.95 |
Units granted (in shares) | 1,000,000.0 |  |
Units, forfeited (in shares) | 300,000 |  |
Weighted average grant date fair value, forfeited (in usd per share) | $ 226.15 |  |
Stock options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration period of stock options from date of grant | 10 years |  |
Total intrinsic value of stock options exercised during the year | $ 67 | $ 56 | 98
Actual tax benefits realized from tax deductions from option exercises | $ 14 | $ 12 | $ 21
Performance units [Member] |  |  |
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 | 1.9 |  |
Number of shares added back for tax withholding on full value awards | 1.9 |  |
Weighted average grant date fair value, granted (in usd per share) | $ 247.48 | $ 254.68 | $ 249.07
Total fair value of units that vested during the year | $ 150 | $ 149 | $ 230
Total unrecognized compensation cost related to nonvested awards | $ 132 |  |
Weighted average number of years over which compensation cost related to nonvested awards is expected to be recognized | 1 year |  |
Units outstanding (in shares) | 1,600,000 |  |
Weighted-average grant date fair value | $ 250.27 | $ 229.39 |
Units granted (in shares) | 600,000 |  |
Units, forfeited (in shares) | 100,000 |  |
Weighted average grant date fair value, forfeited (in usd per share) | $ 250.94 |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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