Employee Benefit Plan, Subsequent Event	12 Months Ended
Dec. 31, 2025
EBP-43-1301883-004 [ASSP]
EBP, Subsequent Event [Line Items]
EBP, Subsequent Event [Text Block]	NOTE 8. SUBSEQUENT EVENTS As part of collective bargaining agreements ratified during 2025, certain bargained employees (representing approximately 60% of current plan participants) no longer participate in the AT&T Savings and Security Plan but instead participate in the AT&T Retirement Savings Plan effective January 1, 2026. The participant balances and assets held by these bargained employees, totaling approximately $1,300,000, were transferred from the AT&T Savings and Security Plan into the AT&T Retirement Savings Plan on January 28, 2026. As part of collective bargaining agreements ratified during 2026, the remaining bargained employees participating in the AT&T Savings and Security Plan will instead participate in the AT&T Retirement Savings Plan effective on October 1, 2026. Subsequent to the effective date the remaining participant balances and assets held by these bargained employees will be transferred from the AT&T Savings and Security Plan into the AT&T Retirement Savings Plan.

Employee Benefit Plan, Subsequent Event

12 Months Ended

Dec. 31, 2025

NOTE 8. SUBSEQUENT EVENTS

As part of collective bargaining agreements ratified during 2025, certain bargained employees (representing approximately 60% of current plan participants) no longer participate in the AT&T Savings and Security Plan but instead participate in the AT&T Retirement Savings Plan effective January 1, 2026. The participant balances and assets held by these bargained employees, totaling approximately $1,300,000, were transferred from the AT&T Savings and Security Plan into the AT&T Retirement Savings Plan on January 28, 2026.

As part of collective bargaining agreements ratified during 2026, the remaining bargained employees participating in the AT&T Savings and Security Plan will instead participate in the AT&T Retirement Savings Plan effective on October 1, 2026. Subsequent to the effective date the remaining participant balances and assets held by these bargained employees will be transferred from the AT&T Savings and Security Plan into the AT&T Retirement Savings Plan.