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Debt (Narrative) (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 29, 2018 | Feb. 28, 2019 | Mar. 30, 2019 | Mar. 30, 2019 | Feb. 01, 2019 | Sep. 29, 2018
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Unamortized Discount |  |  | $ 49 | $ 49 |  | $ 15
Four Point Zero Zero Percentage Senior Unsecured Notes due March, Two Thousand Twenty Six and Four Point Three Five Percentage Senior Unsecured Notes Due March, Two Thousand Twenty Nine [Domain] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Issuance Costs, Gross |  |  |  |  | $ 26 |
Long-term Debt |  |  |  |  | 1,800 |
Debt Instrument, Unamortized Discount |  |  |  |  | 36 |
Proceeds from Issuance of Unsecured Debt |  | $ 2,764 |  |  |  |
5.10% Notes due September 2048 (2048 Notes) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt |  |  |  |  | 1,000 |
Long-term Debt, Gross |  |  | $ 1,500 | $ 1,500 | 1,500 | 500
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.10% | 5.10% |  |
Four Point Zero Zero Percentage Senior Unsecured Notes Due March, Two Thousand Twenty Six [Domain] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 800 | $ 800 | $ 800 | 0
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.00% | 4.00% | 4.00% |
Four Point Three Five Percentage Senior Unsecured Notes Due March Two Thousand And Twenty Nine [Member] [Domain] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 1,000 | $ 1,000 | $ 1,000 | 0
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.35% | 4.35% | 4.35% |
Revolving Credit Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 1,750 | $ 1,750 |  |
Amount available for borrowing under credit facility |  |  | 1,750 | 1,750 |  |
Revolving credit facility |  |  | 0 | 0 |  | 0
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 |  |  | 111 | 111 |  |
Commercial paper |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  | 1,000 | 1,000 |  |
Commercial paper |  |  | $ 182 | $ 182 |  | $ 605
Short-term Debt, Weighted Average Interest Rate, at Point in Time |  |  | 2.64% | 2.64% |  |
Debt Instrument, Term |  |  |  | 15 days |  |
Term Loan [Member] | 364-Day due November 2019 [Member] [Domain] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  | $ 1,800 |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.125% |  |  |  |  |

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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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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition 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. + References Reference 1: 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 2: 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 Reference 3: 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 + Details
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