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Stock-based compensation (Textual) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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) | 19,000,000 |  |
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 | $ 346 |  |
Weighted average number of years over which compensation cost related to nonvested awards is expected to be recognized | 1 year 9 months 18 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) | $ 233.10 | $ 235.63 | $ 182.12
Total fair value of units that vested during the year | $ 166 | $ 161 | $ 160
Units outstanding (in shares) | 3,000,000.0 | 3,000,000.0 |
Weighted-average grant date fair value | $ 217.95 | $ 198.11 |
Units granted (in shares) | 1,300,000 |  |
Units, forfeited (in shares) | 400,000 |  |
Weighted average grant date fair value, forfeited (in usd per share) | $ 213.32 |  |
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 | $ 56 | $ 98 | 68
Actual tax benefits realized from tax deductions from option exercises | $ 12 | $ 21 | $ 15
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) | $ 254.68 | $ 249.07 | $ 188.40
Total fair value of units that vested during the year | $ 149 | $ 230 | $ 176
Total unrecognized compensation cost related to nonvested awards | $ 130 |  |
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 | 1,800,000 |
Weighted-average grant date fair value | $ 229.39 | $ 207.52 |
Units granted (in shares) | 600,000 |  |
Units, forfeited (in shares) | 200,000 |  |
Weighted average grant date fair value, forfeited (in usd per share) | $ 226.32 |  |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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