Segment Information (Intersegment Details) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues [Abstract]
Total revenues	$ (42,340)	$ (44,588)	$ (126,069)	$ (134,372)
Total Intersegment Revenues
Revenues [Abstract]
Total revenues	815	821	2,409	2,548
Consolidations
Revenues [Abstract]
Total revenues	473	479	1,300	1,330
Eliminations and consolidations
Revenues [Abstract]
Total revenues	1,288	1,300	3,709	3,878
Communications | Total Intersegment Revenues
Revenues [Abstract]
Total revenues	3	2	7	10
WarnerMedia | Total Intersegment Revenues
Revenues [Abstract]
Total revenues	812	819	2,402	2,538
Latin America | Total Intersegment Revenues
Revenues [Abstract]
Total revenues	$ 0	$ 0	$ 0	$ 0