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Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Oct. 01, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grant	16,150,273
Cash received from exercise of stock options	$ 102	$ 154	$ 128
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Expiration period	10 years
Grant-date fair value of options granted	$ 18.31	$ 13.42	$ 11.47
Stock-based compensation expense, net of income taxes	$ 13	$ 22	$ 23
Related tax benefit	$ 6	$ 14	$ 15
Options vested (in shares)	2,200,000	4,100,000	3,800,000
Grant date fair value of options vested	$ 27	$ 47	$ 38
Cash received from exercise of stock options	102	154	128
Tax benefit related to stock options exercised	30	65	80
Total intrinsic value of options exercised	103	164	204
Amount realized, related to excess tax deductions	20	$ 42	$ 58
Total unrecognized compensation cost related to stock option plans	$ 18
Total unrecognized compensation cost, time frame for recognition, weighted average number of years	1 year 4 months
Stock Options [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	1.50%	1.30%	1.20%
Stock Options [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	1.50%	1.40%	2.60%
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense, net of income taxes	$ 22	$ 18	$ 14
Related tax benefit	$ 9	$ 11	$ 9
Total unrecognized compensation cost, time frame for recognition, weighted average number of years	1 year 11 months
Number of Shares - Vested	(608,371)	(500,000)	(200,000)
Restricted stock awards, grant date fair value of shares vested	$ 27	$ 19	$ 4
Total unrecognized compensation cost related to share-based awards other than options	$ 40
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Stock-based compensation expense, net of income taxes	$ 12	16	11
Related tax benefit	$ 5	$ 10	$ 7
Total unrecognized compensation cost, time frame for recognition, weighted average number of years	1 year 10 months
Number of Shares - Vested	(396,468)
Total unrecognized compensation cost related to share-based awards other than options	$ 25
Performance Shares [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights, performance criteria	0.00%
Performance Shares [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights, performance criteria	200.00%

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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