Segment Information (Intersegment Assets, Equity Affiliates Investments and Capital Expenditures Details) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Assets	$ 394,795	$ 407,060
Investments in Equity Method Investees	295	1,251	$ 3,533
Capital Expenditures	20,263	17,853	$ 19,626
Corporate and eliminations
Segment Reporting Information [Line Items]
Assets	(94,770)	(106,260)
Investments in Equity Method Investees	295	1,251
Capital Expenditures	659	679
Communications | Operating Segments
Segment Reporting Information [Line Items]
Assets	481,757	504,006
Investments in Equity Method Investees	0	0
Capital Expenditures	19,335	16,876
Latin America Business Segment | Operating Segments
Segment Reporting Information [Line Items]
Assets	7,808	9,314
Investments in Equity Method Investees	0	0
Capital Expenditures	$ 269	$ 298