Earnings per Share (Reconciliation of Weighted Average Shares Outstanding and Calculation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Dec. 28, 2019	Sep. 28, 2019	Dec. 29, 2018	Sep. 29, 2018	Dec. 28, 2019	Dec. 29, 2018
Earnings Per Share [Abstract]
Net income	$ 298.8	$ 20.0	$ 254.8	$ 122.3	$ 318.8	$ 377.1
Weighted-average basic shares (shares)	276.0		289.9		280.8	289.3
Effect of dilutive securities (shares)	0.7		1.1		1.0	2.1
Weighted-average diluted shares (shares)	276.7		291.0		281.8	291.4
Net income per share:
Basic (USD per share)	$ 1.08		$ 0.88		$ 1.14	$ 1.30
Diluted (USD per share)	$ 1.08		$ 0.88		$ 1.13	$ 1.29