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041213 - Disclosure - Pension And Postretirement Benefits (Estimated Future Benefit Payments) (Details)
(http://att.com/role/DisclosurePensionAndPostretirementBenefitsEstimatedFutureBenefitPaymentsDetails)
TableSchedule of Defined Benefit Plans Disclosures [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000732717 (http://www.sec.gov/CIK)
Defined Benefit Plan Disclosure [Line Items]Period [Axis]
2016-12-31
Defined Benefit Plans Disclosures, Defined Benefit Plans [Axis]
Pension Benefit [Member]Postretirement Benefit [Member]
Estimated future benefit payments under our pension and postretirement plans - 2017
4,938,000,000  
1,809,000,000  
Estimated future benefit payments under our pension and postretirement plans - 2018
4,437,000,000  
1,797,000,000  
Estimated future benefit payments under our pension and postretirement plans - 2019
4,312,000,000  
1,788,000,000  
Estimated future benefit payments under our pension and postretirement plans - 2020
4,264,000,000  
1,783,000,000  
Estimated future benefit payments under our pension and postretirement plans - 2021
4,200,000,000  
1,776,000,000  
Estimated future benefit payments under our pension and postretirement plans - Years 2022 - 2026
19,764,000,000  
8,225,000,000