Fair Value Measurements (Schedule Of Fair Value Of Derivatives, Net Of Legal Right To Offset Derivative Settlements) (Fair Value, Inputs, Level 2 [Member], USD $) In Millions	Jun. 30, 2011		Sep. 30, 2010
Fair Value, Inputs, Level 2 [Member]
Guaranteed investment contract	$ 15	[1]	$ 14	[1]
Derivatives assets relating to interest rates	3	[2]	5	[2]
Derivatives assets relating to foreign currency	1	[2]		[2]
Total assets at fair value	19		19
Derivatives liabilities relating to foreign currency	50	[2]	42	[2]
Total liabilities at fair value	$ 50		$ 42

[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" or "Other liabilities" in the consolidated balance sheets.