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Accounting Policies (Subsequent Events) (Details) - AT&T Mobility II, LLC - Preferred Stock - Series A - USD ($)
shares in Millions, $ in Millions
9 Months Ended 12 Months Ended
Oct. 24, 2022
Sep. 30, 2022
Dec. 31, 2022
Nov. 01, 2022
Subsequent Event [Line Items]        
Noncontrolling Interest, Preferred Stock, shares of common stock that can be exercised to put or redemption options in any 12-month period   107    
Forecast | Subsequent Event        
Subsequent Event [Line Items]        
Shares of common stock settled to put and redemption options (in shares) 105      
Preferred interest, securities issued (in shares) 319     213
Redemption of preferred interest in subsidiary $ 2,600      
Put or redemption option, minimum exercise price calculation, value added to accrued and unpaid distributions in the aggregate $ 5,300      
Preferred interest distributions     $ 373