Financial Instruments - Changes in Fair Value Level 3 Assets and Liabilities (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Nov. 30, 2014
Level 3
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, beginning of period	$ 4,000,000	$ 0	$ 3,000,000	$ 0
Purchases, issuances, sales and settlements:
Purchases	0	3,000,000	5,000,000	3,000,000
Settlements	0	0	(11,000,000)	0
Transfer in and / or out of Level 3	0	0	0	0
Reclass between short-term and long-term	(1,000,000)	0	0	0
Fair Value, end of period	1,000,000	2,000,000	1,000,000	2,000,000
Short-term | Foreign currency option contracts | Level 3
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, beginning of period	2,000,000	0	2,000,000	0
Purchases, issuances, sales and settlements:
Purchases	0	3,000,000	5,000,000	3,000,000
Settlements	0	0	(10,000,000)	0
Transfer in and / or out of Level 3	0	0	0	0
Reclass between short-term and long-term	0	(1,000,000)	(1,000,000)	(1,000,000)
Fair Value, end of period	0	1,000,000	0	1,000,000
Long-term | Foreign currency option contracts | Level 3
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, beginning of period	2,000,000	0	1,000,000	0
Purchases, issuances, sales and settlements:
Purchases	0	0	0	0
Settlements	0	0	(1,000,000)	0
Transfer in and / or out of Level 3	0	0	0	0
Reclass between short-term and long-term	(1,000,000)	1,000,000	1,000,000	1,000,000
Fair Value, end of period	1,000,000	1,000,000	1,000,000	1,000,000
Included in other income | Level 3
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Total unrealized gains (losses):	0	0	0	0
Total realized gains (losses):	(1,000,000)	0	2,000,000	0
Included in other income | Short-term | Foreign currency option contracts | Level 3
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Total unrealized gains (losses):	0	0	0	0
Total realized gains (losses):	(1,000,000)	0	2,000,000	0
Included in other income | Long-term | Foreign currency option contracts | Level 3
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Total unrealized gains (losses):	0	0	0	0
Total realized gains (losses):	0	0	0	0
Included in cost of sales | Level 3
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Total unrealized gains (losses):	(1,000,000)	(1,000,000)	(1,000,000)	(1,000,000)
Total realized gains (losses):	0	0	3,000,000	0
Included in cost of sales | Short-term | Foreign currency option contracts | Level 3
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Total unrealized gains (losses):	(1,000,000)	(1,000,000)	(1,000,000)	(1,000,000)
Total realized gains (losses):	0	0	3,000,000	0
Included in cost of sales | Long-term | Foreign currency option contracts | Level 3
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Total unrealized gains (losses):	0	0	0	0
Total realized gains (losses):	0	$ 0	0	$ 0
India, Rupees | Foreign currency option contracts
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Total realized gains (losses):	(1,000,000)		2,000,000
Brazil, Brazil Real | Foreign currency option contracts
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Total realized gains (losses):	$ (1,000,000)		$ 2,000,000
Purchases, issuances, sales and settlements:
Total notional amount					$ 48,000,000