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Fair Value Measurements - Reconciliation of Net Liabilities Classified as Level 3 (Detail) - Level 3
$ in Millions
9 Months Ended
Jun. 30, 2015
USD ($)
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Balance at September 30, 2014 $ (3)
Additions 0
Reductions 0
Payments 2
Balance at June 30, 2015 $ (1)