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Basis of Presentation and Significant Accounting Policies - Impact of Adoption of Accounting Standards on Consolidated Balance Sheet (Details) - USD ($) $ in Millions | Sep. 30, 2018 | [1] | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Trade accounts receivable | $ 10,024 |  | $ 8,234 | $ 8,221 | [1]
Inventories | 8,184 | [2] | 7,567 | 7,578 | [1],[2]
Current tax assets | 3,686 |  | 3,036 | 3,050 | [1]
Noncurrent deferred tax assets and other noncurrent tax assets | 1,875 |  | 1,838 | 1,855 | [1]
Other noncurrent assets | 2,980 |  | 3,023 | 3,227 | [1]
Other current liabilities | 10,490 |  | 10,992 | 11,115 | [1]
Noncurrent deferred tax liabilities | 5,512 |  | 3,988 | 3,900 | [1]
Other noncurrent liabilities | 6,367 |  | 5,690 | 6,149 | [1]
Retained earnings | 91,995 |  | 86,466 | 85,291 | [1]
Accumulated other comprehensive loss | $ (10,417) |  | $ (10,235) | (9,321) | [1]
As Previously Reported [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Trade accounts receivable |  |  |  | 8,221 |
Inventories |  |  |  | 7,578 |
Current tax assets |  |  |  | 3,050 |
Noncurrent deferred tax assets and other noncurrent tax assets |  |  |  | 1,855 |
Other noncurrent assets |  |  |  | 3,227 |
Other current liabilities |  |  |  | 11,115 |
Noncurrent deferred tax liabilities |  |  |  | 3,900 |
Other noncurrent liabilities |  |  |  | 6,149 |
Retained earnings |  |  |  | 85,291 |
Accumulated other comprehensive loss |  |  |  | (9,321) |
Revenues [Member] | Effect of Change Higher/(Lower) [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Trade accounts receivable |  |  |  | 13 |
Inventories |  |  |  | (11) |
Current tax assets |  |  |  | (11) |
Noncurrent deferred tax assets and other noncurrent tax assets |  |  |  | (17) |
Other noncurrent assets |  |  |  | 0 |
Other current liabilities |  |  |  | (123) |
Noncurrent deferred tax liabilities |  |  |  | 106 |
Other noncurrent liabilities |  |  |  | (459) |
Retained earnings |  |  |  | 450 |
Accumulated other comprehensive loss |  |  |  | 0 |
Financial Assets and Liabilities [Member] | Effect of Change Higher/(Lower) [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Trade accounts receivable |  |  |  | 0 |
Inventories |  |  |  | 0 |
Current tax assets |  |  |  | 0 |
Noncurrent deferred tax assets and other noncurrent tax assets |  |  |  | 0 |
Other noncurrent assets |  |  |  | 0 |
Other current liabilities |  |  |  | 0 |
Noncurrent deferred tax liabilities |  |  |  | 0 |
Other noncurrent liabilities |  |  |  | 0 |
Retained earnings |  |  |  | 419 |
Accumulated other comprehensive loss |  |  |  | (419) |
Income Tax Accounting [Member] | Effect of Change Higher/(Lower) [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Trade accounts receivable |  |  |  | 0 |
Inventories |  |  |  | 0 |
Current tax assets |  |  |  | (3) |
Noncurrent deferred tax assets and other noncurrent tax assets |  |  |  | 0 |
Other noncurrent assets |  |  |  | (204) |
Other current liabilities |  |  |  | 0 |
Noncurrent deferred tax liabilities |  |  |  | (18) |
Other noncurrent liabilities |  |  |  | 0 |
Retained earnings |  |  |  | (189) |
Accumulated other comprehensive loss |  |  |  | 0 |
Reclassification of Certain Tax Effects from AOCI [Member] | Effect of Change Higher/(Lower) [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Trade accounts receivable |  |  |  | 0 |
Inventories |  |  |  | 0 |
Current tax assets |  |  |  | 0 |
Noncurrent deferred tax assets and other noncurrent tax assets |  |  |  | 0 |
Other noncurrent assets |  |  |  | 0 |
Other current liabilities |  |  |  | 0 |
Noncurrent deferred tax liabilities |  |  |  | 0 |
Other noncurrent liabilities |  |  |  | 0 |
Retained earnings |  |  |  | 495 |
Accumulated other comprehensive loss |  |  |  | $ (495) |
[1] | Amounts may not add due to rounding.
[2] | The change from December 31, 2017 reflects increases for certain products to meet targeted levels in the normal course of business, including inventory build for supply recovery, network strategy and new product launches, partially offset by a decrease due to foreign exchange.

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