Description of Business, Accounting Policies, and Supplemental Disclosures - Accounts Receivable, Net and Other (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net and other	$ 32,891	$ 24,542
Allowance for doubtful accounts	1,100	1,100	$ 718
Additions to allowance for doubtful accounts	1,000	1,400	1,000
Deductions to allowance for doubtful accounts	1,100	1,000	$ 793
Customer receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net and other	20,200	14,800
Vendor receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net and other	5,300	4,800
Seller receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net and other	$ 1,000	$ 381