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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 | Dec. 31, 2018 | [1] | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Trade accounts receivable | $ 8,025 | $ 8,234 | $ 8,221 | [1]
Inventories | 7,508 | 7,567 | 7,578 | [1]
Current tax assets | 3,374 | 3,036 | 3,050 | [1]
Noncurrent deferred tax assets and other noncurrent tax assets | 1,924 | 1,838 | 1,855 | [1]
Other noncurrent assets | 2,799 | 3,023 | 3,227 | [1]
Other current liabilities | 10,753 | 10,992 | 11,115 | [1]
Noncurrent deferred tax liabilities | 3,700 | 3,988 | 3,900 | [1]
Other noncurrent liabilities | 5,850 | 5,690 | 6,149 | [1]
Retained earnings | 89,554 | 86,466 | 85,291 | [1]
Accumulated other comprehensive loss | $ (11,275) | $ (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) |
Effect of Change Higher/(Lower) [Member] | Revenues [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 |
Effect of Change Higher/(Lower) [Member] | Financial Assets and Liabilities [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) |
Effect of Change Higher/(Lower) [Member] | Income Tax Accounting [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 |
Effect of Change Higher/(Lower) [Member] | Reclassification of Certain Tax Effects from AOCI [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.

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