Segment Information (Intersegment Details) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues [Abstract]
Total revenues	$ (44,588)	$ (45,739)	$ (134,372)	$ (122,763)
Operating Segments [Member]
Revenues [Abstract]
Total revenues	(45,481)	(46,489)	(137,032)	(123,190)
Total Intersegment Revenues [Member]
Revenues [Abstract]
Total revenues	821	850	2,548	1,061
Eliminations and consolidations [Member]
Revenues [Abstract]
Total revenues	1,300	1,281	3,878	2,063
Communications [Member] | Operating Segments [Member]
Revenues [Abstract]
Total revenues	(35,401)	(36,007)	(105,837)	(106,498)
Communications [Member] | Total Intersegment Revenues [Member]
Revenues [Abstract]
Total revenues	2	6	10	8
WarnerMedia [Member] | Operating Segments [Member]
Revenues [Abstract]
Total revenues	(7,846)	(8,204)	(24,575)	(9,709)
WarnerMedia [Member] | Total Intersegment Revenues [Member]
Revenues [Abstract]
Total revenues	812	844	2,531	1,053
Latin America [Member] | Operating Segments [Member]
Revenues [Abstract]
Total revenues	(1,730)	(1,833)	(5,205)	(5,809)
Latin America [Member] | Total Intersegment Revenues [Member]
Revenues [Abstract]
Total revenues	0	0	0	0
Xandr [Member] | Operating Segments [Member]
Revenues [Abstract]
Total revenues	(504)	(445)	(1,415)	(1,174)
Xandr [Member] | Total Intersegment Revenues [Member]
Revenues [Abstract]
Total revenues	7	0	7	0
Consolidations [Member]
Revenues [Abstract]
Total revenues	(407)	(531)	(1,218)	(1,636)
Consolidations [Member] | Total Intersegment Revenues [Member]
Revenues [Abstract]
Total revenues	$ 479	$ 431	$ 1,330	$ 1,002