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Debt (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Dec. 30, 2017 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017
Line of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | $ 1,500,000,000.0 |  | $ 1,750,000,000.00 |
Amount available for borrowing under credit facility | $ 1,720,000,000.00 |  | $ 1,720,000,000.00 |  |
Commercial paper |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | 1,000,000,000 |  | 1,000,000,000 |  |
Commercial paper | $ 1,000,000,000 |  | $ 1,000,000,000 |  | $ 778,000,000
Short-term Debt, Weighted Average Interest Rate, at Point in Time | 2.31% |  | 2.31% |  |
Debt Instrument, Term |  |  | 50 days |  |
7.00% Notes due May 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross | $ 0 |  | $ 0 |  | 120,000,000
Repayments of Long-term Debt | 120,000,000 |  |  |  |
Standby Letters of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Letters of Credit Outstanding, Amount | 0 |  | 0 |  |
Bilateral Letters Of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Letters of Credit Outstanding, Amount | 105,000,000 |  | 105,000,000 |  |
Term Loan [Member] | Tranche B due August 2020 (2.93% at 6/30/2018) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross | 750,000,000 |  | 750,000,000 |  | 500,000,000
Term Loan [Member] | Tranche B due August 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross | $ 0 |  | $ 0 |  | $ 427,000,000
Repayments of Long-term Debt |  | $ 427,000,000 |  |  |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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