Compensation Expense Related to Stock Options, Stock Appreciation Rights and Restricted Stock Units (RSUs) (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2012	Apr. 02, 2011	Mar. 31, 2012	Apr. 02, 2011
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Amortization of previously capitalized equity-based compensation	$ 16	$ 6	$ 24	$ 35