Basis of Presentation and Significant Accounting Policies - Accrued Rebates and Other Accruals (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Schedule Of Accrued Liabilities [Line Items]
Total accrued rebates and other sales-related accruals	$ 5,850	$ 4,708
Trade accounts receivable, less allowance for doubtful accounts [Member]
Schedule Of Accrued Liabilities [Line Items]
Total accrued rebates and other sales-related accruals	1,077	861
Other current liabilities [Member]
Schedule Of Accrued Liabilities [Line Items]
Accrued rebates	3,811	3,017
Other accruals	528	432
Other noncurrent liabilities [Member]
Schedule Of Accrued Liabilities [Line Items]
Total accrued rebates and other sales-related accruals	$ 433	$ 399