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Basis of Presentation and Significant Accounting Policies - Accrued Rebates and Other Accruals (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Schedule Of Accrued Liabilities [Line Items]
Accrued rebates and other accruals	$ 5,548	$ 4,923
Trade accounts receivable, less allowance for doubtful accounts [Member]
Schedule Of Accrued Liabilities [Line Items]
Accrued rebates and other accruals	1,297	1,352
Other current liabilities [Member]
Schedule Of Accrued Liabilities [Line Items]
Accrued rebates	3,235	2,674
Other accruals	641	512
Other noncurrent liabilities [Member]
Schedule Of Accrued Liabilities [Line Items]
Accrued rebates and other accruals	$ 374	$ 385