Accounting Policies and Supplemental Disclosures - Accounts Receivable, Net and Other (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net and other	$ 47,768	$ 52,253
Prepaid expenses and other current assets	5,600	5,400
Allowance for doubtful accounts	1,700	1,700
Customer receivables, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net and other	31,800	34,100
Vendor receivables, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net and other	6,700	8,500
Seller receivables, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net and other	600	1,000
Other receivables, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net and other	$ 3,100	$ 3,300