Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011	Sep. 30, 2011
Related Persons Paragraph (Details) [Abstract]
NAI license revenues earned			$ 11	$ 12
CBS [Member]
Consolidated Statements of Earnings
Revenues	54	79	144	187
Operating expenses	72	96	181	226
Consolidated Balance Sheets [Abstract]
Accounts receivable	5		5		6
Other assets	1		1		1
Total due from other related parties	6		6		7
Accounts payable	3		3		1
Participants' share and residuals, current	162		162		162
Program rights obligations, current	94		94		73
Program rights obligations, noncurrent	185		185		243
Other liabilities	33		33		37
Total due to other related parties	477		477		516
Other Related Parties [Member]
Consolidated Statements of Earnings
Revenues	57	48	117	86
Operating expenses	35	22	53	31
Selling, general and administrative	(4)	(4)	(8)	(8)
Consolidated Balance Sheets [Abstract]
Accounts receivable	97		97		88
Other assets	1		1		2
Total due from other related parties	98		98		90
Accounts payable	14		14		32
Other liabilities	11		11		10
Total due to other related parties	$ 25		$ 25		$ 42