Consolidated Statements of Shareholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Shares	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Balance (in shares) at Dec. 30, 2017		215
Balance at beginning of period at Dec. 30, 2017	$ 2,751	$ 2	$ 2,720	$ 124	$ (95)
Share-based compensation expense	7		7
Proceeds from employee stock purchase plan	4		4
Exercise of stock options (in shares)		1
Exercise of stock options	7	$ 0	7
Changes in retirement benefit obligations, net of income tax	1				1
Unrecognized gain on interest rate swaps, net of income tax	9				9
Net income	67			67
Balance (in shares) at Mar. 31, 2018		216
Balance at end of period at Mar. 31, 2018	2,846	$ 2	2,738	191	(85)
Balance (in shares) at Dec. 29, 2018		217
Balance at beginning of period at Dec. 29, 2018	3,229	$ 2	2,780	531	(84)
Share-based compensation expense	6		6
Proceeds from employee stock purchase plan	5		5
Exercise of stock options (in shares)		1
Exercise of stock options	6		6
Tax withholding payments for net share-settled equity awards	(2)
Changes in retirement benefit obligations, net of income tax	1				1
Unrecognized gain on interest rate swaps, net of income tax	(6)				(6)
Net income	71			71
Balance (in shares) at Mar. 30, 2019		218
Balance at end of period at Mar. 30, 2019	$ 3,310	$ 2	$ 2,795	$ 602	$ (89)