Revenues and Contract Costs - Schedule of Receivables from Contracts with Customers (Details) - USD ($) $ in Millions	Jun. 30, 2023	Jan. 01, 2023	Jun. 30, 2022	Jan. 01, 2022
Revenue from Contract with Customer [Abstract]
Receivables	$ 10,573	$ 11,274	$ 10,620	$ 10,758
Device payment plan agreement receivables	$ 16,878	$ 16,648	$ 14,439	$ 12,888