Segment Information (Summary Of Operating Revenues And Expenses By Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenues	$ 122,336	$ 122,428	$ 120,741
Operations and Support Expenses	82,707	80,190	107,307
Depreciation and Amortization	20,580	18,777	18,021
Operating Income (Loss)	19,049	23,461	(4,587)
Operating Segments
Segment Reporting Information [Line Items]
Revenues	121,884	121,970	120,211
Operations and Support Expenses	74,659	76,223	76,462
Depreciation and Amortization	20,090	18,087	17,339
Operating Income (Loss)	27,135	27,660	26,410
DTV -related retained costs
Segment Reporting Information [Line Items]
Revenues	0	0	8
Operations and Support Expenses	465	686	878
Depreciation and Amortization	414	586	549
Operating Income (Loss)	(879)	(1,272)	(1,419)
Parent Administration Support
Segment Reporting Information [Line Items]
Revenues	(2)	(7)	(32)
Operations and Support Expenses	1,722	1,416	1,378
Depreciation and Amortization	6	6	16
Operating Income (Loss)	(1,730)	(1,429)	(1,426)
Securitization Fees
Segment Reporting Information [Line Items]
Revenues	116	85	65
Operations and Support Expenses	628	604	419
Depreciation and Amortization	0	0	0
Operating Income (Loss)	(512)	(519)	(354)
Value Portfolio
Segment Reporting Information [Line Items]
Revenues	338	380	489
Operations and Support Expenses	102	99	139
Depreciation and Amortization	17	22	41
Operating Income (Loss)	219	259	309
Total Corporate
Segment Reporting Information [Line Items]
Revenues	452	458	530
Operations and Support Expenses	2,917	2,805	2,814
Depreciation and Amortization	437	614	606
Operating Income (Loss)	(2,902)	(2,961)	(2,890)
Certain significant items
Segment Reporting Information [Line Items]
Revenues	0	0	0
Operations and Support Expenses	5,131	1,162	28,031
Depreciation and Amortization	53	76	76
Operating Income (Loss)	(5,184)	(1,238)	(28,107)
Communications | Operating Segments
Segment Reporting Information [Line Items]
Revenues	117,652	118,038	117,067
Operations and Support Expenses	71,124	72,874	73,650
Depreciation and Amortization	19,433	17,363	16,681
Operating Income (Loss)	27,095	27,801	26,736
Communications | Mobility | Operating Segments
Segment Reporting Information [Line Items]
Revenues	85,255	83,982	81,780
Operations and Support Expenses	48,724	49,604	49,770
Depreciation and Amortization	10,217	8,517	8,198
Operating Income (Loss)	26,314	25,861	23,812
Communications | Business Wireline | Operating Segments
Segment Reporting Information [Line Items]
Revenues	18,819	20,883	22,538
Operations and Support Expenses	13,352	14,217	14,934
Depreciation and Amortization	5,555	5,377	5,314
Operating Income (Loss)	(88)	1,289	2,290
Communications | Consumer Wireline | Operating Segments
Segment Reporting Information [Line Items]
Revenues	13,578	13,173	12,749
Operations and Support Expenses	9,048	9,053	8,946
Depreciation and Amortization	3,661	3,469	3,169
Operating Income (Loss)	869	651	634
Latin America Business Segment | Operating Segments
Segment Reporting Information [Line Items]
Revenues	4,232	3,932	3,144
Operations and Support Expenses	3,535	3,349	2,812
Depreciation and Amortization	657	724	658
Operating Income (Loss)	40	(141)	(326)
Total Corporate and Other
Segment Reporting Information [Line Items]
Revenues	452	458	530
Operations and Support Expenses	8,048	3,967	30,845
Depreciation and Amortization	490	690	682
Operating Income (Loss)	$ (8,086)	$ (4,199)	$ (30,997)