v3.20.4

Acquisitions, Dispositions And Other Adjustments (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Business Combinations [Abstract] |
Schedule of Unaudited Pro Forma Consolidated Results of Operations | The following unaudited pro forma consolidated results of operations assume that the acquisition of Time Warner was completed as of January 1, 2017.
| (Unaudited) Year Ended December 31,
| 2018 |  | 2017
Total operating revenues | $ | 183,651 |  |  | $ | 188,769 |
Net Income Attributable to AT&T | 20,814 |  |  | 31,380 |
Basic Earnings Per Share Attributable to Common Stock | $ | 2.86 |  |  | $ | 4.30 |
Diluted Earnings Per Share Attributable to Common Stock | $ | 2.85 |  |  | $ | 4.26 |

X
- Definition Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
Name: | us-gaap_BusinessAcquisitionProFormaInformationTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_BusinessCombinationsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration