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Debt (Narrative) (Details) - USD ($) $ in Millions		1 Months Ended	12 Months Ended
	Nov. 30, 2018	Feb. 28, 2019	Sep. 28, 2019	Feb. 01, 2019	Sep. 29, 2018
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount			$ 0
Debt Instrument, Unamortized Discount			48		$ 15
Maturities of debt in 2019			2,104
Maturities of debt in 2020			535
Maturities of debt in 2021			1,033
Maturities of debt in 2022			493
Maturities of debt in 2023			1,266
Debt Instrument, Basis Spread on Variable Rate	1.125%
Notes due May 2019 (2019 Notes)
Debt Instrument [Line Items]
Long-term debt, gross			0		300
Extinguishment of Debt, Amount			$ 300
Debt Instrument, Interest Rate, Stated Percentage			2.76%
Notes due August 2019 (2019 Notes)
Debt Instrument [Line Items]
Long-term debt, gross			$ 0		1,000
Extinguishment of Debt, Amount			$ 1,000
Debt Instrument, Interest Rate, Stated Percentage			2.65%
3.9% Senior Notes Due September, Two Thousand and Twenty Three [Member]
Debt Instrument [Line Items]
Long-term debt, gross			$ 400		400
Debt Instrument, Interest Rate, Stated Percentage			3.90%
5.1% Notes Due September, Two Thousand and Forty Eight [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 1,000
Long-term debt, gross			$ 1,500	1,500	500
Debt Instrument, Interest Rate, Stated Percentage			5.10%
7.00% Notes Due May 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			7.00%
4.00% Senior Unsecured Notes due March, 2026, 4.35% Senior Unsecured Notes Due March, 2029 and 5.10% Senior Unsecured Notes Due September 2048 [Domain]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount				36
Proceeds from Issuance of Unsecured Debt		$ 2,764
Debt Issuance Costs, Gross				26
Debt Instrument, Face Amount				1,800
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	0
Debt Instrument, Interest Rate, Stated Percentage			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	0
Debt Instrument, Interest Rate, Stated Percentage			4.35%	4.35%
Term Loan [Member] | 364-Day due November 2019 [Member] [Domain]
Debt Instrument [Line Items]
Extinguishment of Debt, Amount			$ 1,800
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity			1,750
Amount available for borrowing under credit facility			1,680
Revolving credit facility			70		0
Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount			0
Bilateral Letters Of Credit [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount			99
Commercial Paper [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity			1,000
Commercial Paper			$ 1,000		$ 605
Short-term Debt, Weighted Average Interest Rate, at Point in Time			2.24%
Debt Instrument, Term			25 days

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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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