Additional Financial Information (Summary of Cash Paid for Interest and Taxes) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash paid (received) during the period for:
Interest	$ 5,703	$ 5,981
Income taxes, net of refunds	758	400
Payments to Acquire Property, Plant and Equipment	13,252	15,397
Interest during construction	750	1,007
Acquisitions	923	9,959
Business acquisitions
Cash paid (received) during the period for:
Acquisitions	0	0
Spectrum Licenses
Cash paid (received) during the period for:
Acquisitions	309	9,076
Interest during construction	614	883
Property, Plant and Equipment [Member]
Cash paid (received) during the period for:
Payments to Acquire Property, Plant and Equipment	13,116	15,273
Interest during construction	$ 136	$ 124