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Stock-based compensation (Textual) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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) | 28,000,000 |  |
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 | $ 308 |  |
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 |  |
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) | $ 182.12 | $ 179.18 | $ 163.99
Total fair value of units that vested during the year | $ 160 | $ 167 | $ 182
Units outstanding (in shares) | 3,100,000 | 3,100,000 |
Weighted-average grant date fair value | $ 174.97 | $ 168.11 |
Units granted (in shares) | 1,200,000 |  |
Units, forfeited (in shares) | 200,000 |  |
Weighted average grant date fair value, forfeited (in usd per share) | $ 170.52 |  |
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 | $ 68 | $ 53 | 60
Actual tax benefits realized from tax deductions from option exercises | $ 15 | $ 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) | $ 188.40 | $ 189.21 | $ 178.87
Total fair value of units that vested during the year | $ 176 | $ 133 | $ 219
Total unrecognized compensation cost related to nonvested awards | $ 113 |  |
Weighted average number of years over which compensation cost related to nonvested awards is expected to be recognized | 1 year |  |
Units outstanding (in shares) | 2,000,000.0 | 2,000,000.0 |
Weighted-average grant date fair value | $ 185.64 | $ 180.12 |
Units granted (in shares) | 800,000 |  |
Units, forfeited (in shares) | 200,000 |  |
Weighted average grant date fair value, forfeited (in usd per share) | $ 186.66 |  |

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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=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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