Fair Value Measurements (Schedule Of Fair Value Of Derivatives, Net Of Legal Right To Offset Derivative) (Details) (Significant Observable Inputs (Level 2) [Member], USD $) In Millions	Sep. 30, 2011		Sep. 30, 2010
Significant Observable Inputs (Level 2) [Member]
Guaranteed investment contract	$ 14	[1]	$ 14	[1]
Derivatives assets relating to interest rates	3	[2]	5	[2]
Total assets at fair value	17		19
Derivatives liabilities relating to foreign currency	41	[2]	42	[2]
Hedged long-term debt	61		77
Total liabilities at fair value	$ 102		$ 119

[1] Included in "Other assets" in the Consolidated Balance Sheets.

[2] Included in "Prepaid expenses and other current assets", "Other assets", "Accounts payable and accrued liabilities" and "Other liabilities" in the Consolidated Balance Sheets.