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Debt (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Sep. 29, 2018	Sep. 29, 2018	Sep. 29, 2018	Jun. 08, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	$ 0	$ 0	$ 0
Debt Instrument, Unamortized Discount	15	15	15				$ 15
Maturities of debt in 2019	1,911	1,911	1,911
Maturities of debt in 2020	1,037	1,037	1,037
Maturities of debt in 2021	511	511	511
Maturities of debt in 2022	1,007	1,007	1,007
Maturities of debt in 2023	405	405	405
Three Point Nine Percentage Senior Notes Due September, Two Thousand and Twenty Three and Five Point One Percentage Senior Notes Due September, Two Thousand and Forty Eight [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount	3	3	3
Proceeds from Issuance of Unsecured Debt	897
Debt Issuance Costs, Gross	9	9	9
Debt Instrument, Face Amount	900	900	900
3.9% Senior Notes Due September, Two Thousand and Twenty Three [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 400	$ 400	$ 400				0
Debt Instrument, Interest Rate, Stated Percentage	3.90%	3.90%	3.90%
5.1% Notes Due September, Two Thousand and Forty Eight [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 500	$ 500	$ 500				0
Debt Instrument, Interest Rate, Stated Percentage	5.10%	5.10%	5.10%
Tranche B due August 2020 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	$ 0	$ 0	$ 750			500
Extinguishment of Debt, Amount		750
7.00% Notes Due May 2018 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	$ 0	0				120
Extinguishment of Debt, Amount			$ 120
Debt Instrument, Interest Rate, Stated Percentage	7.00%	7.00%	7.00%
Tranche B due August 2019 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	$ 0	$ 0				427
Extinguishment of Debt, Amount			427
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 1,750	$ 1,500
Amount available for borrowing under credit facility	1,750	1,750	1,750
Bilateral Letters Of Credit [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	105	105	105
Commercial Paper [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	1,000	1,000	1,000
Commercial Paper	$ 605	$ 605	$ 605				$ 778
Short-term Debt, Weighted Average Interest Rate, at Point in Time	2.33%	2.33%	2.33%
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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