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Other Income (Expense), Net (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Other Income (Expense), Net        
Interest income $ 27 $ 2 $ 14 $ 6
Gains (losses) on investments (1) 0 3 4
External services 0 2 2 13
Miscellaneous (5) 0 (3) 2
Total other income (expense), net $ 21 $ 4 $ 16 $ 25