Transactions with DIRECTV (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Related Party Transaction [Line Items]
Investments in and Advances to Equity Affiliates	$ 891		$ 1,251
Accounts Receivable, Related Parties	9,577		$ 10,289
Commercial Arrangements and Transition Service Agreements | Equity Method Investee [Member]
Related Party Transaction [Line Items]
Operations And Support Expenses	145	$ 240
DIRECTV | Equity Method Investee [Member]
Related Party Transaction [Line Items]
Investments in and Advances to Equity Affiliates	685
Accounts Receivable, Related Parties	255
Accounts Payable, Related Parties	$ 41