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ASU 2014-09, Revenue - Revenue from Contracts with Customers (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  | $ 64
Sales and other operating revenues | [1] | $ 18,694 | $ 16,134 |
Cost of revenues | [1] | 17,370 | 14,946 |
Matching buy/sell receivables |  | 1,330 |  |
Income taxes receivables |  | 323 |  |
Consumer Excise Tax |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Sales and other operating revenues |  |  | 1,200 |
Cost of revenues |  |  | $ 1,200 |
Accounting Standards Update 2014-09 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  | $ 1
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Consumer Excise Tax |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Sales and other operating revenues |  | 1,250 |  |
Cost of revenues |  | 1,250 |  |
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Third Party Reimbursements, Noncash Consideration and Imbalances |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Sales and other operating revenues |  | 117 |  |
Cost of revenues |  | $ 117 |  |
[1] | The 2018 period reflects an election to present certain taxes on a net basis. See Notes 2 and 3 for further information.

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