CONSOLIDATED STATEMENTS OF EARNINGS (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
CONSOLIDATED STATEMENTS OF EARNINGS [ABSTRACT]
Sales Revenue, Net	$ 3,331	$ 3,267	$ 7,283	$ 7,095
Expenses [Abstract]:
Operating	1,645	1,721	3,830	3,738
Selling, general and administrative	695	719	1,384	1,419
Depreciation and amortization	59	67	121	138
Total expenses	2,399	2,507	5,335	5,295
Operating Income	932	760	1,948	1,800
Interest Expense Net	(103)	(102)	(208)	(206)
Equity in net losses of investee companies	5	15	15	39
Loss on extinguishment of debt	(21)	(87)	(21)	(87)
Other items, net	(1)	(7)	(5)	(7)
Earnings From Continuing Operations Before Provision For Income Taxes	812	579	1,729	1,539
Provision for income taxes	(213)	(197)	(529)	(528)
Net earnings from continuing operations	599	382	1,200	1,011
Discontinued operations, net of tax	(3)	0	(382)	(10)
Net earnings (Viacom and noncontrolling interests)	596	382	818	1,001
Net (losses) earnings attributable to noncontrolling interests	(11)	(6)	(21)	(15)
Net earnings attributable to Viacom	585	376	797	986
Amounts attributable to Viacom [Abstract]:
Net earnings from continuing operations attributable to Viacom	588	376	1,179	996
Discontinued operations, net of tax	(3)	0	(382)	(10)
Net earnings attributable to Viacom	$ 585	$ 376	$ 797	$ 986
Basic earnings per share attributable to Viacom [Abstract]:
Income (Loss) from Continuing Operations, Per Basic Share	$ 1.09	$ 0.63	$ 2.17	$ 1.66
Income Loss From Discontinued Operations Net Of Tax Per Basic Share	$ 0	$ 0	$ (0.71)	$ (0.01)
Basic net earnings per share attributable to Viacom	$ 1.09	$ 0.63	$ 1.46	$ 1.65
Diluted earnings per share attributable to Viacom [Abstract]:
Income (Loss) From Continuing Operations Per Diluted Share	$ 1.08	$ 0.63	$ 2.14	$ 1.65
Income Loss From Discontinued Operations Net Of Tax Per Diluted Share	$ (0.01)	$ 0	$ (0.69)	$ (0.02)
Diluted net earnings per share attributable to Viacom	$ 1.07	$ 0.63	$ 1.45	$ 1.63
Weighted average number of common shares outstanding [Abstract]:
Weighted average number of common shares outstanding, basic	537.5	594.4	544.1	599.0
Weighted average number of common shares outstanding, diluted	544.4	601.1	550.8	604.6
Dividends declared per share of Class A and Class B common stock	$ 0.25	$ 0.15	$ 0.50	$ 0.30