Segment Information (Intersegment Details) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues [Abstract]
Total revenues	$ (40,950)	$ (44,957)	$ (83,729)	$ (89,784)
Operating Segments [Member]
Revenues [Abstract]
Total revenues	(41,638)	(45,859)	(85,325)	(91,551)
Total Intersegment Revenues [Member]
Revenues [Abstract]
Total revenues	776	869	1,595	1,727
Eliminations and consolidations [Member]
Revenues [Abstract]
Total revenues	1,125	1,322	2,421	2,578
Communications [Member] \| Operating Segments [Member]
Revenues [Abstract]
Total revenues	(33,592)	(35,267)	(67,841)	(70,436)
Communications [Member] \| Total Intersegment Revenues [Member]
Revenues [Abstract]
Total revenues	2	8	4	8
WarnerMedia [Member] \| Operating Segments [Member]
Revenues [Abstract]
Total revenues	(6,814)	(8,835)	(14,662)	(17,640)
WarnerMedia [Member] \| Total Intersegment Revenues [Member]
Revenues [Abstract]
Total revenues	774	861	1,591	1,719
Latin America [Member] \| Operating Segments [Member]
Revenues [Abstract]
Total revenues	(1,232)	(1,757)	(2,822)	(3,475)
Latin America [Member] \| Total Intersegment Revenues [Member]
Revenues [Abstract]
Total revenues	0	0	0	0
Consolidations [Member]
Revenues [Abstract]
Total revenues	(437)	(420)	(825)	(811)
Consolidations [Member] \| Total Intersegment Revenues [Member]
Revenues [Abstract]
Total revenues	$ 349	$ 453	$ 826	$ 851