Debt (Narrative) (Details) - USD ($)	12 Months Ended
	Oct. 03, 2020	Mar. 28, 2020	Sep. 28, 2019
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	$ 0
Debt Instrument, Unamortized Discount	45,000,000		$ 48,000,000
Maturities of debt in 2019	550,000,000
Maturities of debt in 2020	2,543,000,000
Maturities of debt in 2021	431,000,000
Maturities of debt in 2022	1,269,000,000
Maturities of debt in 2023	12,000,000
Notes due June 2020 ("2020 Notes")
Debt Instrument [Line Items]
Long-term debt, gross	0		350,000,000
Extinguishment of Debt, Amount	350,000,000
3.9% Senior Notes Due September, Two Thousand and Twenty Three [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 400,000,000		400,000,000
Debt Instrument, Interest Rate, Stated Percentage	3.90%
5.1% Notes Due September, Two Thousand and Forty Eight [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,500,000,000		1,500,000,000
Debt Instrument, Interest Rate, Stated Percentage	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	$ 800,000,000		800,000,000
Debt Instrument, Interest Rate, Stated Percentage	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	$ 1,000,000,000		1,000,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.35%
Notes due August 2020 ("2020 Notes")
Debt Instrument [Line Items]
Long-term debt, gross	$ 0		400,000,000
Extinguishment of Debt, Amount	400,000,000
4.10% Notes due September 2020 ("2020 Notes")
Debt Instrument [Line Items]
Long-term debt, gross	0		280,000,000
Extinguishment of Debt, Amount	278,000,000
Term Loan Facility Due March 2022 [Domain]
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,500,000,000		0
Debt Instrument, Interest Rate, Stated Percentage	1.69%
Debt Instrument, Unused Borrowing Capacity, Amount		$ 1,500,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 1,750,000,000
Amount available for borrowing under credit facility	1,750,000,000
Revolving credit facility	0		70,000,000
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	101,000,000
Commercial Paper [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	1,000,000,000
Commercial Paper	$ 0		$ 1,000,000,000