Quarterly report pursuant to Section 13 or 15(d)

Composition of Certain Financial Statement Items Accounts Receivable (Details)

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Composition of Certain Financial Statement Items Accounts Receivable (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Sep. 30, 2012
Accounts Receivable, Net [Abstract]    
Trade, net of allowances for doubtful accounts $ 1,855 $ 1,418
Long-term contracts 30 32
Other 64 9
Accounts receivable, net 1,949 1,459
Allowance for doubtful accounts related to trade receivables $ 2 $ 1