Earnings Per Share - Reconciliation of Basic Net Earnings per Share to Diluted Net Earnings per Share (Details) - $ / shares shares in Millions	3 Months Ended								12 Months Ended
	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Reconciliation of basic net earnings per share to diluted net earnings per share
Basic net earnings per share (in dollars per share)	$ 1.52	$ 0.67	$ 2.11	$ 1.41	$ 1.14	$ 1.47	$ 1.47	$ 1.63	$ 5.72	$ 5.70	$ 0.48
Average shares outstanding — basic (in shares)									2,645.1	2,681.5	2,692.0
Potential shares exercisable under stock option plans (in shares)									136.3	139.0	139.7
Less: shares repurchased under treasury stock method (in shares)									(97.8)	(92.5)	(87.3)
Convertible debt shares (in shares)									0.7	0.7	0.9
Average shares outstanding - diluted (in shares)									2,684.3	2,728.7	2,745.3
Diluted net earnings per share (in dollars per share)	$ 1.50	$ 0.66	$ 2.08	$ 1.39	$ 1.12	$ 1.44	$ 1.45	$ 1.60	$ 5.63	$ 5.61	$ 0.47