Financial Statements (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Jun. 30, 2011	Sep. 30, 2010	Jun. 30, 2010
Carrying amounts and classification of assets and liabilities for consolidated VIE's
Current assets	$ 179	$ 215	$ 187
Noncurrent assets	55	69	72
Total assets	234	284	259
Current liabilities	132	174	165
Noncurrent liabilities	0	0	0
Total liabilities	132	174	165
Financial Statements (Textuals)
Investment balance of the Company's nonconsolidated VIE's		41	41
Interest percentage acquired in equity method investee	40.00%
Number of years after the closing date at which time the Company has a contractual right to purchase the remaining equity interest in the investee	3 years
Remaining equity interest percentage to be acquired in equity method investee	60.00%
Number of years after the closing date at which time the Company is subject to a contractual obligation at the counterparty's option to sell the Company's equity investment in the investee to the counterparty	5 years 6 months
Interest percentage minimum for investments in partially-owned affiliates to be accounted for by the equity method	20.00%
Number of VIE's in which Company was primary beneficiary	2
The Company holds less than this percentage ownership in its consolidated VIE's	50.00%
Number of months the Company has to set the date of the put closing or to secure a third party buyer once notice has been received	12 months
Nonconsolidated VIE's 1 [Member]
Financial Statements (Textuals)
Investment balance of the Company's nonconsolidated VIE's	43
Nonconsolidated VIE's 2 [Member]
Financial Statements (Textuals)
Investment balance of the Company's nonconsolidated VIE's	$ 48