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Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grant	12,952,617
Cash received from exercise of stock options	$ 99	$ 102	$ 154
Stock Options [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	2.50%	1.50%
Vesting period	3 years
Expiration period	10 years
Grant-date fair value of options granted	$ 11.35	$ 18.31	$ 13.42
Stock-based compensation expense, net of income taxes	$ 16	$ 13	$ 22
Related tax benefit	$ 3	$ 6	$ 14
Options vested (in shares)	1,200,000	2,200,000	4,100,000
Grant date fair value of options vested	$ 18	$ 27	$ 47
Cash received from exercise of stock options	99	102	154
Tax benefit related to stock options exercised	21	30	65
Total intrinsic value of options exercised	79	103	164
Amount realized, related to excess tax deductions	14	20	$ 42
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 6 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			1.30%
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			1.40%
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense, net of income taxes	$ 26	22	$ 18
Related tax benefit	$ 8	$ 9	$ 11
Total unrecognized compensation cost, time frame for recognition, weighted average number of years	1 year 10 months 24 days
Number of Shares - Vested	(540,075)	(600,000)	(500,000)
Restricted stock awards, grant date fair value of shares vested	$ 29	$ 27	$ 19
Total unrecognized compensation cost related to share-based awards other than options	$ 46
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	$ 16	12	16
Related tax benefit	$ 4	$ 5	$ 10
Total unrecognized compensation cost, time frame for recognition, weighted average number of years	1 year 9 months 18 days
Number of Shares - Vested	(825,361)
Total unrecognized compensation cost related to share-based awards other than options	$ 26
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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