Preparation Of Interim Financial Statements (Policies)	6 Months Ended
Jun. 30, 2025
Accounting Policies [Abstract]
Principles of Consolidation [Policy Text Block]	The consolidated financial statements include our controlled subsidiaries, as well as variable interest entities (VIE) where we are deemed to be the primary beneficiary. All significant intercompany transactions are eliminated in consolidation. Investments in entities that we do not control but have significant influence are accounted for under the equity method.
Basis of Accounting [Policy Text Block]	The preparation of financial statements in conformity with U.S. generally accepted accounting principles (GAAP) requires management to make estimates and assumptions, including estimates of fair value, probable losses and expenses, that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. Certain prior period amounts have been conformed to the current period’s presentation providing further disaggregation of activities within Cash from Operations in our consolidated statements of cash flows and additional revenue categories for our Business Wireline and Consumer Wireline business units (see Note 5). Stock Repurchase Program In December 2024, the Board of Directors authorized the repurchase of up to $10,000 of AT&T common stock. We began buying back stock under this program in the second quarter of 2025. For the six months ended June 30, 2025, we had repurchased approximately 34 million shares totaling $958 under this authorization, excluding brokerage fees and the one percent excise tax imposed by the Inflation Reduction Act of 2022. To implement repurchase authorizations, we use open market repurchase programs, relying on Rule 10b5-1 of the Securities Exchange Act of 1934 where feasible. Tax Legislation On July 4, 2025, the One Big Beautiful Bill Act was enacted, which restores or makes permanent certain expiring business tax provisions from the Tax Cuts and Jobs Act of 2017. We do not anticipate the legislation to materially impact our income tax expense, but expect that it will have a material impact on cash taxes paid relative to our expectations.

Preparation Of Interim Financial Statements (Policies)

6 Months Ended

Jun. 30, 2025

Principles of Consolidation [Policy Text Block]

The consolidated financial statements include our controlled subsidiaries, as well as variable interest entities (VIE) where we are deemed to be the primary beneficiary. All significant intercompany transactions are eliminated in consolidation. Investments in entities that we do not control but have significant influence are accounted for under the equity method.

Basis of Accounting [Policy Text Block]

The preparation of financial statements in conformity with U.S. generally accepted accounting principles (GAAP) requires management to make estimates and assumptions, including estimates of fair value, probable losses and expenses, that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. Certain prior period amounts have been conformed to the current period’s presentation providing further disaggregation of activities within Cash from Operations in our consolidated statements of cash flows and additional revenue categories for our Business Wireline and Consumer Wireline business units (see Note 5).

Stock Repurchase Program In December 2024, the Board of Directors authorized the repurchase of up to $10,000 of AT&T common stock. We began buying back stock under this program in the second quarter of 2025. For the six months ended June 30, 2025, we had repurchased approximately 34 million shares totaling $958 under this authorization, excluding brokerage fees and the one percent excise tax imposed by the Inflation Reduction Act of 2022.

To implement repurchase authorizations, we use open market repurchase programs, relying on Rule 10b5-1 of the Securities Exchange Act of 1934 where feasible.

Tax Legislation On July 4, 2025, the One Big Beautiful Bill Act was enacted, which restores or makes permanent certain expiring business tax provisions from the Tax Cuts and Jobs Act of 2017. We do not anticipate the legislation to materially impact our income tax expense, but expect that it will have a material impact on cash taxes paid relative to our expectations.