Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Product Information [Line Items]
REVENUES	$ 11,450	$ 10,892	$ 34,003	$ 32,403
Video
Product Information [Line Items]
REVENUES	4,359	4,332	13,134	12,987
Internet
Product Information [Line Items]
REVENUES	4,195	3,809	12,322	11,286
Voice
Product Information [Line Items]
REVENUES	477	512	1,470	1,599
Residential revenue
Product Information [Line Items]
REVENUES	9,031	8,653	26,926	25,872
Small and medium business
Product Information [Line Items]
REVENUES	974	922	2,882	2,737
Enterprise
Product Information [Line Items]
REVENUES	644	632	1,939	1,881
Commercial revenue
Product Information [Line Items]
REVENUES	1,618	1,554	4,821	4,618
Advertising sales
Product Information [Line Items]
REVENUES	394	440	1,134	1,223
Mobile
Product Information [Line Items]
REVENUES	192	17	490	17
Other
Product Information [Line Items]
REVENUES	$ 215	$ 228	$ 632	$ 673