Subsequent Events (AT&T Pension Benefits Plan) (Details) - Pension Plan - Subsequent Event		3 Months Ended
	Apr. 26, 2023 USD ($) employee	Jun. 30, 2023 USD ($)
Subsequent Event [Line Items]
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement		$ 8,050,000,000
Defined Benefit Plan Number Of Participants | employee	96,000
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement		$ 350,000,000