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Taxes - Sumamry of Unrecognized Income Tax Benefits and Taxes Other Than on Income (Details 2) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Changes to company's unrecognized tax benefits |  |  |  |
Balance at January 1 |  | $ 4,828 | $ 3,031 | $ 3,042
Foreign currency effects |  | (6) |  |
Foreign currency effects |  |  | 43 | 1
Additions based on tax positions taken in current year |  | 239 | 1,853 | 245
Additions for tax positions taken in prior years |  | 153 | 1,166 | 181
Reductions for tax positions taken in prior years |  | (131) | (90) | (390)
Settlements with taxing authorities in current year |  | (13) | (1,173) | (36)
Reductions as a result of a lapse of the applicable statute of limitations |  | 0 | (2) | (12)
Balance at December 31 |  | 5,070 | 4,828 | 3,031
Income Tax Authority [Line Items] |  |  |  |
Excise and similar taxes on products and merchandise |  |  | 7,189 | 6,905
Import duties and other levies | [1] | 4,867 | 12,331 | 11,668
Total taxes other than on income |  | 4,867 | 12,331 | 11,668
United States |  |  |  |
Income Tax Authority [Line Items] |  |  |  |
Excise and similar taxes on products and merchandise |  | 4,830 | 4,398 | 4,335
Consumer excise taxes collected on behalf of third parties |  | (4,830) | 0 | 0
Import duties and other levies |  | 15 | 11 | 9
Property and other miscellaneous taxes |  | 1,577 | 1,824 | 1,680
Payroll taxes |  | 246 | 241 | 252
Taxes on production |  | 325 | 206 | 159
Total taxes other than on income |  | 2,163 | 6,680 | 6,435
International |  |  |  |
Income Tax Authority [Line Items] |  |  |  |
Excise and similar taxes on products and merchandise |  | 3,031 | 2,791 | 2,570
Consumer excise taxes collected on behalf of third parties |  | (3,031) | 0 | 0
Import duties and other levies |  | 37 | 45 | 33
Property and other miscellaneous taxes |  | 2,370 | 2,563 | 2,379
Payroll taxes |  | 132 | 137 | 145
Taxes on production |  | 165 | 115 | 106
Total taxes other than on income |  | $ 2,704 | $ 5,651 | $ 5,233
[1] | 2017 and 2016 include excise, value-added and similar taxes of $7,189 and $6,905, respectively, collected on behalf of third parties. Beginning in 2018, these taxes are netted in "Taxes other than on income" in accordance with Accounting Standards Update (ASU) 2014-09. Refer to Note 25, "Revenue" beginning on page 88.

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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=115205541&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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