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Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Taxes other than on income | [1] | $ 1,259 | $ 3,213 | $ 3,966 | $ 9,149 |
Includes excise, value-added and similar taxes |  |  | $ 1,867 |  | $ 5,315 |
Receivables |  | $ 11,900 |  | 11,900 |  | $ 9,800
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Taxes other than on income |  |  |  | $ 5,900 |  |
[1] | The three-month and nine-month comparative periods ended September 30, 2017, include excise, value-added and similar taxes of $1,867 million and $5,315 million, respectively, collected on behalf of third parties. Beginning in 2018, these taxes are netted in "Taxes other than on income" in accordance with ASU 2014-09. Refer to Note 17, "Revenue" beginning on page 24.

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