Additional Financial Information (Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Accounts payable and accrued liabilities:
Accounts payable	$ 31,101	$ 29,511
Accrued payroll and commissions	1,605	2,082
Current portion of employee benefit obligation	1,173	1,234
Current portion of Mobility preferred interests	2,670	0
Accrued interest	2,160	2,438
Accrued taxes	798	1,148
Other	3,137	2,682
Total accounts payable and accrued liabilities	$ 42,644	$ 39,095