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Revenue (Details) - USD ($) $ in Millions	3 Months Ended
Revenue (Details) - USD ($) $ in Millions	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Product Information [Line Items]
REVENUES	$ 13,597	$ 13,735
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net	3,439		$ 3,457
Other noncurrent assets	4,216		4,233
Equipment installment plan receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net	1,300		1,300
Other noncurrent assets	1,100		$ 1,100
Internet
Product Information [Line Items]
REVENUES	5,852	5,930
Mobile service
Product Information [Line Items]
REVENUES	1,052	914
Connectivity
Product Information [Line Items]
REVENUES	6,904	6,844
Video
Product Information [Line Items]
REVENUES	3,252	3,580
Voice
Product Information [Line Items]
REVENUES	338	356
Residential revenue
Product Information [Line Items]
REVENUES	10,494	10,780
Small business
Product Information [Line Items]
REVENUES	1,090	1,088
Mid-market & large business
Product Information [Line Items]
REVENUES	749	734
Commercial revenue
Product Information [Line Items]
REVENUES	1,839	1,822
Advertising sales
Product Information [Line Items]
REVENUES	358	340
Other
Product Information [Line Items]
REVENUES	$ 906	$ 793