Employee Benefit Plan, Subsequent Event |
12 Months Ended |
|---|---|
Dec. 31, 2025 | |
| EBP-43-1301883-009 [ARSP] | |
| 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 AT&T Savings and Security 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.
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| EBP-43-1301883-011 [PRRSP] | |
| 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 AT&T Savings and Security 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.
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