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Additional Financial Information (Summary of Cash Paid for Interest and Taxes) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Cash paid (received) during the period for:    
Interest $ 5,981 $ 5,931
Income taxes, net of refunds 400 215
Payments to Acquire Property, Plant and Equipment 15,397 12,051
Interest during construction 1,007 648
Acquisitions 9,959 23,533
Business acquisitions    
Cash paid (received) during the period for:    
Acquisitions 0 0
Spectrum Licenses    
Cash paid (received) during the period for:    
Acquisitions 9,076 23,017
Interest during construction 883 516
Property, Plant and Equipment [Member]    
Cash paid (received) during the period for:    
Payments to Acquire Property, Plant and Equipment 15,273 11,919
Interest during construction $ 124 $ 132