Divestitures (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended	3 Months Ended			1 Months Ended	3 Months Ended
	Dec. 30, 2011	Dec. 24, 2010	Sep. 30, 2011	Dec. 30, 2011 Atkore	Dec. 24, 2010 Atkore	Dec. 22, 2010 Atkore	Sep. 30, 2010 European water business	Dec. 24, 2010 European water business	Dec. 24, 2010 Electrical and Metal Products
Divestitures
Preferred stock sold as percentage of outstanding capital stock						51.00%
Divestiture of businesses, net of cash divested		$ 710			$ 713
Net cash proceeds on sale of discontinued operations							264
Net gain on divestiture		246			259				259
Cumulative translation gain on divestiture					33
Cash divested on sale		10					7
Pre-tax gain (loss) on sale of discontinued operations		173						173
Company's share in net income (loss) of equity investments				(9)
Gain (loss) on divestiture and write-down to fair value less cost to sell of businesses that did not meet the criteria of discontinued operations		246
Working capital adjustment that reduced the gain on disposal			$ 11