Revenue Recognition (Revenue Categories) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 31,343	$ 30,043	$ 29,643	$ 29,712	$ 31,095	$ 31,326	$ 35,740	$ 35,877	$ 120,741	$ 134,038	$ 143,050
Service [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									97,831	111,565	124,057
Wireless Service [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									62,674	59,498	57,726
Video Service
Disaggregation of Revenue [Line Items]
Total operating revenues										15,423	28,465
Business Service
Disaggregation of Revenue [Line Items]
Total operating revenues									21,891	23,294	24,627
IP Broadband
Disaggregation of Revenue [Line Items]
Total operating revenues									9,669	9,085	8,534
Legacy Voice and Data [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									2,069	2,406	2,767
Other Service [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									1,528	1,859	1,938
Other Capitalized Property Plant and Equipment [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									22,910	22,473	18,993
Operating Segments
Disaggregation of Revenue [Line Items]
Total operating revenues									120,211	117,477	112,527
Operating Segments | Communications
Disaggregation of Revenue [Line Items]
Total operating revenues									117,067	114,730	109,965
Operating Segments | Communications | Mobility
Disaggregation of Revenue [Line Items]
Total operating revenues									81,780	78,254	72,564
Operating Segments | Communications | Mobility | Service [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									60,499	57,590	55,542
Operating Segments | Communications | Mobility | Wireless Service [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									60,499	57,590	55,542
Operating Segments | Communications | Mobility | Video Service
Disaggregation of Revenue [Line Items]
Total operating revenues										0	0
Operating Segments | Communications | Mobility | Business Service
Disaggregation of Revenue [Line Items]
Total operating revenues									0	0	0
Operating Segments | Communications | Mobility | IP Broadband
Disaggregation of Revenue [Line Items]
Total operating revenues									0	0	0
Operating Segments | Communications | Mobility | Legacy Voice and Data [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									0	0	0
Operating Segments | Communications | Mobility | Other Service [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									0	0	0
Operating Segments | Communications | Mobility | Other Capitalized Property Plant and Equipment [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									21,281	20,664	17,022
Operating Segments | Communications | Business Wireline
Disaggregation of Revenue [Line Items]
Total operating revenues									22,538	23,937	25,083
Operating Segments | Communications | Business Wireline | Service [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									21,891	23,224	24,313
Operating Segments | Communications | Business Wireline | Wireless Service [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									0	0	0
Operating Segments | Communications | Business Wireline | Video Service
Disaggregation of Revenue [Line Items]
Total operating revenues										0	0
Operating Segments | Communications | Business Wireline | Business Service
Disaggregation of Revenue [Line Items]
Total operating revenues									21,891	23,224	24,313
Operating Segments | Communications | Business Wireline | IP Broadband
Disaggregation of Revenue [Line Items]
Total operating revenues									0	0	0
Operating Segments | Communications | Business Wireline | Legacy Voice and Data [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									0	0	0
Operating Segments | Communications | Business Wireline | Other Service [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									0	0	0
Operating Segments | Communications | Business Wireline | Other Capitalized Property Plant and Equipment [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									647	713	770
Operating Segments | Communications | Consumer Wireline
Disaggregation of Revenue [Line Items]
Total operating revenues									12,749	12,539	12,318
Operating Segments | Communications | Consumer Wireline | Service [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									12,749	12,446	12,311
Operating Segments | Communications | Consumer Wireline | Wireless Service [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									0	0	0
Operating Segments | Communications | Consumer Wireline | Video Service
Disaggregation of Revenue [Line Items]
Total operating revenues										0	0
Operating Segments | Communications | Consumer Wireline | Business Service
Disaggregation of Revenue [Line Items]
Total operating revenues									0	0	0
Operating Segments | Communications | Consumer Wireline | IP Broadband
Disaggregation of Revenue [Line Items]
Total operating revenues									9,669	9,085	8,534
Operating Segments | Communications | Consumer Wireline | Legacy Voice and Data [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									1,746	1,977	2,213
Operating Segments | Communications | Consumer Wireline | Other Service [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									1,334	1,384	1,564
Operating Segments | Communications | Consumer Wireline | Other Capitalized Property Plant and Equipment [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									0	93	7
Operating Segments | Latin America Business Segment
Disaggregation of Revenue [Line Items]
Total operating revenues									3,144	2,747	2,562
Operating Segments | Latin America Business Segment | Service [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									2,162	1,834	1,656
Operating Segments | Latin America Business Segment | Wireless Service [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									2,162	1,834	1,656
Operating Segments | Latin America Business Segment | Video Service
Disaggregation of Revenue [Line Items]
Total operating revenues										0	0
Operating Segments | Latin America Business Segment | Business Service
Disaggregation of Revenue [Line Items]
Total operating revenues									0	0	0
Operating Segments | Latin America Business Segment | IP Broadband
Disaggregation of Revenue [Line Items]
Total operating revenues									0	0	0
Operating Segments | Latin America Business Segment | Legacy Voice and Data [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									0	0	0
Operating Segments | Latin America Business Segment | Other Service [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									0	0	0
Operating Segments | Latin America Business Segment | Other Capitalized Property Plant and Equipment [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									982	913	906
Corporate
Disaggregation of Revenue [Line Items]
Total operating revenues									530	16,697	30,790
Corporate | Service [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									530	16,607	30,502
Corporate | Wireless Service [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									13	74	528
Corporate | Video Service
Disaggregation of Revenue [Line Items]
Total operating revenues										15,423	28,465
Corporate | Business Service
Disaggregation of Revenue [Line Items]
Total operating revenues									0	70	314
Corporate | IP Broadband
Disaggregation of Revenue [Line Items]
Total operating revenues									0	0	0
Corporate | Legacy Voice and Data [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									323	429	554
Corporate | Other Service [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									194	611	641
Corporate | Other Capitalized Property Plant and Equipment [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									0	90	288
Eliminations and consolidations
Disaggregation of Revenue [Line Items]
Total operating revenues									0	(136)	(267)
Eliminations and consolidations | Service [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									0	(136)	(267)
Eliminations and consolidations | Wireless Service [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									0	0	0
Eliminations and consolidations | Video Service
Disaggregation of Revenue [Line Items]
Total operating revenues										0	0
Eliminations and consolidations | Business Service
Disaggregation of Revenue [Line Items]
Total operating revenues									0	0	0
Eliminations and consolidations | IP Broadband
Disaggregation of Revenue [Line Items]
Total operating revenues									0	0	0
Eliminations and consolidations | Legacy Voice and Data [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									0	0	0
Eliminations and consolidations | Other Service [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									0	(136)	(267)
Eliminations and consolidations | Other Capitalized Property Plant and Equipment [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues									$ 0	$ 0	$ 0