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Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Product Information [Line Items]
REVENUES	$ 13,146	$ 12,039	$ 38,470	$ 35,473
Internet
Product Information [Line Items]
REVENUES	5,363	4,722	15,670	13,659
Video
Product Information [Line Items]
REVENUES	4,502	4,221	13,224	13,014
Voice
Product Information [Line Items]
REVENUES	409	449	1,202	1,357
Residential revenue
Product Information [Line Items]
REVENUES	10,274	9,392	30,096	28,030
Small and medium business
Product Information [Line Items]
REVENUES	1,062	988	3,116	2,967
Enterprise
Product Information [Line Items]
REVENUES	656	617	1,930	1,845
Commercial revenue
Product Information [Line Items]
REVENUES	1,718	1,605	5,046	4,812
Advertising sales
Product Information [Line Items]
REVENUES	391	460	1,146	1,074
Mobile
Product Information [Line Items]
REVENUES	535	368	1,546	936
Other
Product Information [Line Items]
REVENUES	$ 228	$ 214	$ 636	$ 621

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