| EBP, Reconciliation of Financial Statement to Form 5500 [Table Text Block] |
The following is a reconciliation of Net Assets Available for Benefits per the financial statements to the Form 5500 as of December 31, 2025: | | | | | | | | | | | | | | AT&T
Retirement
Savings Plan | | AT&T
Puerto Rico
Retirement
Savings Plan | | Net Assets Available for Benefits per the financial statements | $ | 45,745,042 | | | $ | 109,758 | | | Distributions payable to participants | (10,504) | | | — | | | Net Assets Available for Benefits per the Form 5500 | $ | 45,734,538 | | | $ | 109,758 | | | | | | |
The following is a reconciliation of Net Assets Available for Benefits per the financial statements to the Form 5500 as of December 31, 2024: | | | | | | | | | | | | | | AT&T
Retirement
Savings Plan | | AT&T
Puerto Rico
Retirement
Savings Plan | | Net Assets Available for Benefits per the financial statements | $ | 43,121,795 | | | $ | 99,901 | | | Distributions payable to participants | (5,869) | | | — | | | Net Assets Available for Benefits per the Form 5500 | $ | 43,115,926 | | | $ | 99,901 | | | | | | |
| | | | | | | | | | | | | | AT&T
Retirement
Savings Plan | | AT&T
Puerto Rico
Retirement
Savings Plan | | Distributions to participants per the financial statements | $ | 5,416,544 | | | $ | 6,576 | | Distributions payable to participants at December 31, 2024 | (5,869) | | | — | | Distributions payable to participants at December 31, 2025 | 10,504 | | | — | | | Distributions to participants per the Form 5500 | $ | 5,421,179 | | | $ | 6,576 | | | | | | |
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| EBP, Reconciliation of Financial Statement to Form 5500 [Table Text Block] |
The following is a reconciliation of Net Assets Available for Benefits per the financial statements to the Form 5500 as of December 31, 2025: | | | | | | | | | | | | | | AT&T
Retirement
Savings Plan | | AT&T
Puerto Rico
Retirement
Savings Plan | | Net Assets Available for Benefits per the financial statements | $ | 45,745,042 | | | $ | 109,758 | | | Distributions payable to participants | (10,504) | | | — | | | Net Assets Available for Benefits per the Form 5500 | $ | 45,734,538 | | | $ | 109,758 | | | | | | |
The following is a reconciliation of Net Assets Available for Benefits per the financial statements to the Form 5500 as of December 31, 2024: | | | | | | | | | | | | | | AT&T
Retirement
Savings Plan | | AT&T
Puerto Rico
Retirement
Savings Plan | | Net Assets Available for Benefits per the financial statements | $ | 43,121,795 | | | $ | 99,901 | | | Distributions payable to participants | (5,869) | | | — | | | Net Assets Available for Benefits per the Form 5500 | $ | 43,115,926 | | | $ | 99,901 | | | | | | |
| | | | | | | | | | | | | | AT&T
Retirement
Savings Plan | | AT&T
Puerto Rico
Retirement
Savings Plan | | Distributions to participants per the financial statements | $ | 5,416,544 | | | $ | 6,576 | | Distributions payable to participants at December 31, 2024 | (5,869) | | | — | | Distributions payable to participants at December 31, 2025 | 10,504 | | | — | | | Distributions to participants per the Form 5500 | $ | 5,421,179 | | | $ | 6,576 | | | | | | |
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