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
	Dec. 31, 2011	Jan. 01, 2011
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Amortization of previously capitalized equity-based compensation	$ 9	$ 29