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Income Taxes (Provision (Benefit) on Income (Loss)) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Reconciliation Of Provision Of Income Taxes [Line Items]                    
U.S. federal and state, Current               $ (1) $ (7) $ (8)
U.S. federal and state, Deferred               (8) (51) (14)
U.S. federal and state, Total               (9) (58) (22)
Foreign, Current               62 57 51
Foreign, Deferred               2 7 1
Foreign, Total               64 64 52
Total U.S and foreign $ 16 $ 23 $ 16 $ 2 $ 10 $ 9 $ (15) $ 55 $ 6 $ 30