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Reconciliation of Beginning and Ending Unrecognized Tax Benefits by Fiscal Year (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Beginning Balance $ 679 $ 850
Increases of unrecognized tax benefits related to prior years 335 186
Decreases of unrecognized tax benefits related to prior years (133) (445)
Increases of unrecognized tax benefits related to current year 144 89
Reductions to unrecognized tax benefits related to lapsing statute of limitations (2) (1)
Ending Balance $ 1,023 $ 679