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Taxes - Summary of Unrecognized Income Tax Benefits and Taxes Other Than on Income (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Changes to company's unrecognized tax benefits |  |  |
Balance at January 1 | $ 4,987 | $ 5,070 | $ 4,828
Foreign currency effects | 2 | 1 |
Foreign currency effects |  |  | (6)
Additions based on tax positions taken in current year | 253 | 94 | 239
Additions for tax positions taken in prior years | 437 | 313 | 153
Reductions for tax positions taken in prior years | (216) | (194) | (131)
Settlements with taxing authorities in current year | (429) | (78) | (13)
Reductions as a result of a lapse of the applicable statute of limitations | (16) | (219) | 0
Balance at December 31 | 5,018 | 4,987 | 5,070
Income Tax Authority [Line Items] |  |  |
Import duties and other levies | 4,499 | 4,136 | 4,867
Total taxes other than on income | 4,499 | 4,136 | 4,867
United States |  |  |
Income Tax Authority [Line Items] |  |  |
Excise and similar taxes on products and merchandise | 4,566 | 4,990 | 4,830
Consumer excise taxes collected on behalf of third parties | (4,566) | (4,990) | (4,830)
Import duties and other levies | 7 | 2 | 15
Property and other miscellaneous taxes | 2,248 | 1,785 | 1,577
Payroll taxes | 235 | 254 | 246
Taxes on production | 317 | 355 | 325
Total taxes other than on income | 2,807 | 2,396 | 2,163
International |  |  |
Income Tax Authority [Line Items] |  |  |
Excise and similar taxes on products and merchandise | 2,367 | 2,801 | 3,031
Consumer excise taxes collected on behalf of third parties | (2,367) | (2,801) | (3,031)
Import duties and other levies | 39 | 35 | 37
Property and other miscellaneous taxes | 1,461 | 1,435 | 2,370
Payroll taxes | 117 | 125 | 132
Taxes on production | 75 | 145 | 165
Total taxes other than on income | $ 1,692 | $ 1,740 | $ 2,704

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- Definition The amount of excise and sales taxes included in sales and revenues, which are then deducted as a cost of sales. Includes excise taxes, which are applied to specific types of transactions or items (such as gasoline or alcohol); and sales, use and value added taxes, which are applied to a broad class of revenue-producing transactions involving a wide range of goods and services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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- Definition A tax based on the assessed value of real estate by the local government. The tax is usually based on the value of property (including the land). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6419918&loc=d3e35301-107843 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from foreign currency translation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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