Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net sales	$ 6,031	$ 5,823
Cost of goods sold	4,979	4,831
Gross profit	1,052	992
Operating expenses:
Distribution, selling and administrative costs	921	887
Restructuring costs	0	2
Total operating expenses	921	889
Operating income	131	103
Other income—net	(2)	(3)
Interest expense—net	42	43
Income before income taxes	91	63
Income tax provision (benefit)	20	(4)
Net income	71	67
Other comprehensive income—net of tax:
Changes in retirement benefit obligations	1	1
Unrecognized (loss) gain on interest rate swaps	(6)	9
Comprehensive income	$ 66	$ 77
Net income per share
Basic (in dollars per share)	$ 0.33	$ 0.31
Diluted (in dollars per share)	$ 0.32	$ 0.31
Weighted-average common shares outstanding
Basic (in shares)	217	215
Diluted (in shares)	219	217