Restructuring (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Mar. 31, 2012
Restructuring Reserve Abstract
Restructuring Reserve, Beginning Balance	$ 124
Severance payments	51
Lease payments	6
Restructuring Reserve, Ending Balance	67
Media Networks Segment [Member]
Restructuring Reserve Abstract
Restructuring Reserve, Beginning Balance	80
Severance payments	28
Lease payments	2
Restructuring Reserve, Ending Balance	50
Filmed Entertainment Segment [Member]
Restructuring Reserve Abstract
Restructuring Reserve, Beginning Balance	44
Severance payments	23
Lease payments	4
Restructuring Reserve, Ending Balance	$ 17