v3.10.0.1
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.