Debt and Financing Arrangements Long-Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014
Debt Instrument [Line Items]
Other Long-term Debt	$ 57	$ 42
Capital lease obligations	48	55
Long-term Debt and Capital Lease Obligations, Including Current Maturities	6,558	6,497
Less: current portion	813	140
Net long-term debt	5,745	6,357
7.7 % Due in 2015
Debt Instrument [Line Items]
Long-term Debt	0	125
5.5 % Due in 2016
Debt Instrument [Line Items]
Long-term Debt	800	802
7.125 % Due in 2017
Debt Instrument [Line Items]
Long-term Debt	153	156
2.6 % Due in 2017
Debt Instrument [Line Items]
Long-term Debt	404	400
2.355 % Due in 2017
Debt Instrument [Line Items]
Long-term Debt	46	46
1.4% Due in 2018
Debt Instrument [Line Items]
Long-term Debt	303	298
5.0 % Due in 2020
Debt Instrument [Line Items]
Long-term Debt	499	499
4.25% Due in 2021
Debt Instrument [Line Items]
Long-term Debt	498	498
3.75 % Due in 2022
Debt Instrument [Line Items]
Long-term Debt	448	448
3.625% Due in 2024
Debt Instrument [Line Items]
Long-term Debt	500	500
6.0 % Due in 2036
Debt Instrument [Line Items]
Long-term Debt	395	395
5.7 % Due in 2041
Debt Instrument [Line Items]
Long-term Debt	299	299
5.25 % Due in 2042
Debt Instrument [Line Items]
Long-term Debt	250	250
4.625% Due in 2044
Debt Instrument [Line Items]
Long-term Debt	447	447
6.95 % Due in 2046
Debt Instrument [Line Items]
Long-term Debt	125	125
4.95% Due in 2064
Debt Instrument [Line Items]
Long-term Debt	449	449
Euro Member Countries, Euro \| Foreign Denominated Debt
Debt Instrument [Line Items]
Long-term Debt	529	663
Japan, Yen \| Foreign Denominated Debt
Debt Instrument [Line Items]
Long-term Debt	$ 308	$ 0

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 16
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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Including both current and noncurrent portions, carrying amount as of the balance sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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