Segment Information (Summary Of Operating Revenues And Expenses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Revenues	$ 30,139	$ 29,712
Operations and Support Expenses	19,506	19,713
EBITDA	10,633	9,999
Depreciation and Amortization	4,631	4,462
Operating Income (Loss)	6,002	5,537
Operating Segments
Segment Reporting Information [Line Items]
Revenues	30,035	29,566
Operations and Support Expenses	18,858	18,896
EBITDA	11,177	10,670
Depreciation and Amortization	4,464	4,285
Operating Income (Loss)	6,713	6,385
Total Corporate
Segment Reporting Information [Line Items]
Revenues	104	146
Operations and Support Expenses	692	626
EBITDA	(588)	(480)
Depreciation and Amortization	150	150
Operating Income (Loss)	(738)	(630)
DTV-related retained costs
Segment Reporting Information [Line Items]
Revenues	0	8
Operations and Support Expenses	169	160
EBITDA	(169)	(152)
Depreciation and Amortization	144	134
Operating Income (Loss)	(313)	(286)
Parent Administration Support
Segment Reporting Information [Line Items]
Revenues	(9)	(12)
Operations and Support Expenses	374	347
EBITDA	(383)	(359)
Depreciation and Amortization	1	6
Operating Income (Loss)	(384)	(365)
Securitization Fees
Segment Reporting Information [Line Items]
Revenues	19	16
Operations and Support Expenses	121	82
EBITDA	(102)	(66)
Depreciation and Amortization	0	0
Operating Income (Loss)	(102)	(66)
Value Portfolio
Segment Reporting Information [Line Items]
Revenues	94	134
Operations and Support Expenses	28	37
EBITDA	66	97
Depreciation and Amortization	5	10
Operating Income (Loss)	61	87
Certain significant items
Segment Reporting Information [Line Items]
Revenues	0	0
Operations and Support Expenses	(44)	191
EBITDA	44	(191)
Depreciation and Amortization	17	27
Operating Income (Loss)	27	(218)
Total Corporate and Other
Segment Reporting Information [Line Items]
Revenues	104	146
Operations and Support Expenses	648	817
EBITDA	(544)	(671)
Depreciation and Amortization	167	177
Operating Income (Loss)	(711)	(848)
Communications | Operating Segments
Segment Reporting Information [Line Items]
Revenues	29,152	28,876
Operations and Support Expenses	18,120	18,265
EBITDA	11,032	10,611
Depreciation and Amortization	4,289	4,124
Operating Income (Loss)	6,743	6,487
Communications | Mobility | Operating Segments
Segment Reporting Information [Line Items]
Revenues	20,582	20,075
Operations and Support Expenses	12,213	12,327
EBITDA	8,369	7,748
Depreciation and Amortization	2,098	2,059
Operating Income (Loss)	6,271	5,689
Communications | Business Wireline | Operating Segments
Segment Reporting Information [Line Items]
Revenues	5,331	5,640
Operations and Support Expenses	3,623	3,702
EBITDA	1,708	1,938
Depreciation and Amortization	1,330	1,299
Operating Income (Loss)	378	639
Communications | Consumer Wireline | Operating Segments
Segment Reporting Information [Line Items]
Revenues	3,239	3,161
Operations and Support Expenses	2,284	2,236
EBITDA	955	925
Depreciation and Amortization	861	766
Operating Income (Loss)	94	159
Latin America - Mexico | Operating Segments
Segment Reporting Information [Line Items]
Revenues	883	690
Operations and Support Expenses	738	631
EBITDA	145	59
Depreciation and Amortization	175	161
Operating Income (Loss)	$ (30)	$ (102)