Borrowing Facilities and Debt (Details) - USD ($) $ in Millions	Jul. 31, 2016	Oct. 25, 2015	Sep. 30, 2015
Debt Instrument [Line Items]
Short-term debt, principal amount	$ 0	$ 1,200
Total long-term debt	3,343	3,342
Total debt	3,343	4,542
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount	3,350	3,350	$ 1,800
Total unamortized discount	(7)	(8)
Total long-term debt	3,343	3,342
Senior Notes [Member] \| 2.650% Unsecured Senior Notes Due 2016 [Member]
Debt Instrument [Line Items]
Short-term debt, principal amount	$ 0	$ 400
Stated interest rate (as percent)	2.65%	2.65%
Effective Interest Rate	2.666%	2.666%
Senior Notes [Member] \| 7.125% Unsecured Senior Notes Due 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount	$ 200	$ 200
Stated interest rate (as percent)	7.125%	7.125%
Effective Interest Rate	7.19%	7.19%
Senior Notes [Member] \| 2.625% Unsecured Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount	$ 600	$ 600
Stated interest rate (as percent)	2.625%	2.625%
Effective Interest Rate	2.64%	2.64%
Senior Notes [Member] \| 4.300% Unsecured Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount	$ 750	$ 750
Stated interest rate (as percent)	4.30%	4.30%
Effective Interest Rate	4.326%	4.326%
Senior Notes [Member] \| 3.900% Unsecured Senior Notes Due 2025 [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount	$ 700	$ 700
Stated interest rate (as percent)	3.90%	3.90%
Effective Interest Rate	3.944%	3.944%
Senior Notes [Member] \| 5.100% Unsecured Senior Notes Due 2035 [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount	$ 500	$ 500
Stated interest rate (as percent)	5.10%	5.10%
Effective Interest Rate	5.127%	5.127%
Senior Notes [Member] \| 5.850% Unsecured Senior Notes Due 2041 [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount	$ 600	$ 600
Stated interest rate (as percent)	5.85%	5.85%
Effective Interest Rate	5.879%	5.879%
Other Debt [Member]
Debt Instrument [Line Items]
Short-term debt, principal amount	$ 0	$ 800
Other Debt [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Effective Interest Rate	1.00%	1.00%
Other Debt [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Effective Interest Rate	1.25%	1.25%

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt discount.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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