Preparation Of Interim Financial Statements (Policies)	9 Months Ended
Sep. 30, 2024
Accounting Policies [Abstract]
Principles of Consolidation [Policy Text Block]	All significant intercompany transactions are eliminated in the consolidation process. Investments in subsidiaries and partnerships which we do not control but have significant influence are accounted for under the equity method. Earnings from certain investments accounted for using the equity method are included in our results on a one quarter lag. We also record our proportionate share of our equity method investees’ other comprehensive income (OCI) items, including translation adjustments.
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.
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]	Goodwill Impairment During the third quarter of 2024, we updated the long-term strategic plan of our Business Wireline reporting unit. The updated plans reflected lower long-term projected future cash flows associated with the industry-wide secular decline, including a faster-than-previously anticipated decline of legacy services. We identified this as an impairment indicator and performed an interim quantitative goodwill impairment test of our Business Wireline reporting unit. The interim impairment test methodology was consistent with our approach for annual impairment testing, using similar models updated with our current view of key inputs and assumptions. We concluded that the calculated fair value of the Business Wireline reporting unit was lower than the book value, resulting in a goodwill impairment. As a result, in the third quarter of 2024, we recorded a noncash goodwill impairment charge of $4,422 in our consolidated statements of income, which represented the entirety of Business Wireline reporting unit goodwill. “Goodwill – Net” included on our consolidated balance sheet at September 30, 2024 totaled $63,432, which is attributable to our Mobility and Consumer Wireline reporting units in the Communications segment. No indicators of impairment were identified for our Mobility and Consumer Wireline reporting units.

Preparation Of Interim Financial Statements (Policies)

9 Months Ended

Sep. 30, 2024

Principles of Consolidation [Policy Text Block]

All significant intercompany transactions are eliminated in the consolidation process. Investments in subsidiaries and partnerships which we do not control but have significant influence are accounted for under the equity method. Earnings from certain investments accounted for using the equity method are included in our results on a one quarter lag. We also record our proportionate share of our equity method investees’ other comprehensive income (OCI) items, including translation adjustments.

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.

Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]

Goodwill Impairment During the third quarter of 2024, we updated the long-term strategic plan of our Business Wireline reporting unit. The updated plans reflected lower long-term projected future cash flows associated with the industry-wide secular decline, including a faster-than-previously anticipated decline of legacy services. We identified this as an impairment indicator and performed an interim quantitative goodwill impairment test of our Business Wireline reporting unit. The interim impairment test methodology was consistent with our approach for annual impairment testing, using similar models updated with our current view of key inputs and assumptions. We concluded that the calculated fair value of the Business Wireline reporting unit was lower than the book value, resulting in a goodwill impairment. As a result, in the third quarter of 2024, we recorded a noncash goodwill impairment charge of $4,422 in our consolidated statements of income, which represented the entirety of Business Wireline reporting unit goodwill. “Goodwill – Net” included on our consolidated balance sheet at September 30, 2024 totaled $63,432, which is attributable to our Mobility and Consumer Wireline reporting units in the Communications segment. No indicators of impairment were identified for our Mobility and Consumer Wireline reporting units.