Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Product Information [Line Items]
REVENUES	$ 12,802	$ 11,696	$ 25,324	$ 23,434
Internet
Product Information [Line Items]
REVENUES	5,221	4,530	10,307	8,937
Video
Product Information [Line Items]
REVENUES	4,378	4,371	8,722	8,793
Voice
Product Information [Line Items]
REVENUES	394	451	793	908
Residential revenue
Product Information [Line Items]
REVENUES	9,993	9,352	19,822	18,638
Small and medium business
Product Information [Line Items]
REVENUES	1,042	983	2,054	1,979
Enterprise
Product Information [Line Items]
REVENUES	636	606	1,274	1,228
Commercial revenue
Product Information [Line Items]
REVENUES	1,678	1,589	3,328	3,207
Advertising sales
Product Information [Line Items]
REVENUES	411	249	755	614
Mobile
Product Information [Line Items]
REVENUES	519	310	1,011	568
Other
Product Information [Line Items]
REVENUES	$ 201	$ 196	$ 408	$ 407