Accounting Changes (Policies)	9 Months Ended
Accounting Changes (Policies)	Jun. 30, 2017
Accounting Changes and Error Corrections [Abstract]
New Accounting Principle Adopted	New Accounting Principles Adopted On October 1, 2016, the Company prospectively adopted amended requirements issued by the Financial Accounting Standards Board ("FASB") relating to the timing of recognition and classification of share-based compensation award-related income tax effects. Upon the settlement of awards in the first three quarters of fiscal year 2017, the Company recorded tax benefits for the three and nine months ended June 30, 2017 of $12 million and $60 million, respectively, to Income tax provision (benefit) within its consolidated statement of income. The Company expects to record additional tax benefits in the fourth quarter of fiscal year 2017. These tax benefits were recorded within Capital in excess of par value on the Company's condensed consolidated balance sheet in the prior-year period. Because these excess tax benefits are no longer recorded in Capital in excess of par value, the current year-to-date adjustment for the dilutive impact of share equivalents from share-based plans, which is used in the Company's computation of diluted earnings per share, increased by approximately 1 million shares. Also per the amended guidance, the Company classified the $60 million of excess tax benefits for the nine months ended June 30, 2017 on its condensed consolidated statement of cash flows within Net Cash Provided by Operating Activities, rather than Net Cash Provided by (Used for) Financing Activities, which included the excess tax benefits for the nine months ended June 30, 2016. The amended guidance allows entities to account for award forfeitures as they occur; however, the Company has elected to continue its determination of compensation cost recognized in each period based upon an estimate of expected future forfeitures. New Accounting Principles Not Yet Adopted In February 2016, the FASB issued a new lease accounting standard which requires lessees to recognize lease assets and lease liabilities on the balance sheet. The new standard also requires expanded disclosures regarding leasing arrangements. The Company is currently evaluating the impact that this new lease accounting standard will have on its consolidated financial statements upon its adoption of the standard on October 1, 2019. In May 2014, the FASB issued a new revenue recognition standard. Under this standard, revenue will be recognized upon the transfer of goods or services to customers and the amount of revenue recognized will reflect the consideration to which a reporting entity expects to be entitled in exchange for those goods or services. The Company intends to adopt the standard, as required, on October 1, 2018 and is currently in the process of completing the initial assessment of the impact that this new revenue recognition standard will have on its consolidated financial statements. As part of the initial assessment, the Company is reviewing a representative sample of its contracts across its various businesses and geographies to identify potential differences that could result from applying the requirements of the new standard. The analysis includes identifying whether there may be differences in timing of revenue recognition under the new standard as well as assessing performance obligations, variable consideration, and contract costs. The Company has not yet estimated the impact, if any, of the new standard on the timing and pattern of its revenue recognition. The Company continues to evaluate the available adoption methods, and apprises both management and its audit committee of the project status regularly.
Commitments and Contingencies	Given the uncertain nature of litigation generally, the Company is not able, in all cases, to estimate the amount or range of loss that could result from an unfavorable outcome of the litigation to which the Company is a party. In accordance with U.S. generally accepted accounting principles, the Company establishes accruals to the extent probable future losses are estimable (in the case of environmental matters, without considering possible third-party recoveries). In view of the uncertainties discussed below, the Company could incur charges in excess of any currently established accruals and, to the extent available, liability insurance. In the opinion of management, any such future charges, individually or in the aggregate, could have a material adverse effect on the Company’s consolidated results of operations and consolidated cash flows.
Derivatives	The Company uses derivative instruments to mitigate certain exposures. The effects these derivative instruments and hedged items have on financial position, financial performance, and cash flows are provided below. Hedges of the transactional foreign exchange exposures resulting primarily from intercompany payables and receivables are undesignated hedges. As such, the gains or losses on these instruments are recognized immediately in income. The offset of these gains or losses against the gains and losses on the underlying hedged items, as well as the hedging costs associated with the derivative instruments, is recognized in Other income (expense), net. The Company’s policy is to manage interest cost using a mix of fixed and variable rate debt. The Company periodically uses interest rate swaps to manage such exposures. Under these interest rate swaps, the Company exchanges, at specified intervals, the difference between fixed and floating interest amounts calculated by reference to an agreed-upon notional principal amount. These swaps are designated as either fair value or cash flow hedges. For interest rate swaps designated as fair value hedges (i.e., hedges against the exposure to changes in the fair value of an asset or a liability or an identified portion thereof that is attributable to a particular risk), changes in the fair value of the interest rate swaps offset changes in the fair value of the fixed rate debt due to changes in market interest rates. Changes in the fair value of the interest rate swaps designated as cash flow hedges (i.e., hedging the exposure to variability in expected future cash flows that is attributable to a particular risk) are offset by amounts recorded in Other comprehensive income (loss). If interest rate derivatives designated as cash flow hedges are terminated, the balance in Accumulated other comprehensive income (loss) attributable to those derivatives is reclassified into earnings over the remaining life of the hedged debt.
Fair Value of Financial Instruments	The Company measures the fair value of forward exchange contracts and interest rate swaps based upon the present value of expected future cash flows using market-based observable inputs including credit risk, interest rate yield curves, foreign currency spot prices and forward prices. Long-term debt is recorded at amortized cost. The fair value of long-term debt is measured based upon quoted prices in active markets for similar instruments, which are considered Level 2 inputs in the fair value hierarchy. The fair value of long-term debt was $19.0 billion and $11.3 billion at June 30, 2017 and September 30, 2016, respectively. The fair value of the current portion of long-term debt was $207 million and $798 million at June 30, 2017 and September 30, 2016, respectively. The contingent consideration liabilities were recognized as part of the consideration transferred by the Company for certain acquisitions. The fair values of the contingent consideration liabilities were estimated using probability-weighted discounted cash flow models that were based upon the probabilities assigned with regard to achievement of the contingent events. The estimated fair values of the contingent consideration liabilities are remeasured each reporting period based upon increases or decreases in the probability of the contingent payments. The decrease to the total contingent consideration liability in the nine months ended June 30, 2017 is primarily attributable to a $40 million payment of a contingent consideration liability recorded in connection with a previously closed acquisition. The Company’s policy is to recognize any transfers into fair value measurement hierarchy levels and transfers out of levels at the beginning of each reporting period.