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Income taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
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Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Apr. 28, 2022 | May 31, 2021
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |
Effective income tax rate | 10.40% |  |  | 12.60% |  |  | 11.80% | 12.60% |  |
Increase in unrecognized tax benefits resulting from tax positions taken during the current period | $ 25 |  |  |  |  |  | $ 120 |  |  |
Stock repurchased | $ 900 | $ 0 | $ 5,410 | $ 1,069 | $ 1,592 | $ 865 | $ 6,310 | $ 3,526 |  |
Domestic Tax Authority |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |
Proposed additional income tax |  |  |  |  |  |  |  |  |  | $ 3,600
Repatriation tax on proposed additional tax |  |  |  |  |  |  |  |  |  | $ 900
Proposed additional income tax 2013-2015 |  |  |  |  |  |  |  |  | $ 5,100 |
Penalties on proposed additional income tax 2013-2015 |  |  |  |  |  |  |  |  | 2,000 |
Repatriation tax on proposed additional tax 2013-2015 |  |  |  |  |  |  |  |  | $ 2,200 |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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