Debt (Major Components Of Debt) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Sep. 30, 2017
Debt Instrument [Line Items]
Revolving credit facility	$ 0	$ 0
Discount on senior notes	(14)	(15)
Other	77	81
Unamortized debt issuance costs	(45)	(50)
Total debt	10,000	10,203
Less current debt	1,128	906
Total long-term debt	8,872	9,297
Commercial paper
Debt Instrument [Line Items]
Commercial paper	$ 1,000	778
7.00% Notes due May 2018
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.00%
Long-term Debt, Gross	$ 120	120
Notes due May 2019 (2.43% at 3/31/2018)
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.43%
Long-term Debt, Gross	$ 300	300
2.65% Notes due August 2019
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.65%
Long-term Debt, Gross	$ 1,000	1,000
Notes due June 2020 (2.57% at 3/31/2018)
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.57%
Long-term Debt, Gross	$ 350	350
Notes due August 2020 (2.34% at 3/31/2018)
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.34%
Long-term Debt, Gross	$ 400	400
4.10% Notes due September 2020
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.10%
Long-term Debt, Gross	$ 282	282
2.25% Notes due August 2021
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.25%
Long-term Debt, Gross	$ 500	500
4.50% Senior notes due June 2022
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.50%
Long-term Debt, Gross	$ 1,000	1,000
3.95% Notes due August 2024
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.95%
Long-term Debt, Gross	$ 1,250	1,250
3.55% Notes due June 2027
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.55%
Long-term Debt, Gross	$ 1,350	1,350
7.00% Notes due January 2028
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.00%
Long-term Debt, Gross	$ 18	18
6.13% Notes due November 2032
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.13%
Long-term Debt, Gross	$ 162	162
4.88% Notes due August 2034
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.88%
Long-term Debt, Gross	$ 500	500
5.15% Notes due August 2044
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.15%
Long-term Debt, Gross	$ 500	500
4.55% Notes due June 2047
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.55%
Long-term Debt, Gross	$ 750	750
Tranche B due August 2019 \| Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 0	427
Tranche B due August 2020 (2.74% at 3/31/2018) \| Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.74%
Long-term Debt, Gross	$ 500	$ 500

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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