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. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Jan. 01, 2017	Oct. 02, 2016	Jul. 03, 2016	Apr. 03, 2016	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Reconciliation of basic net earnings per share to diluted net earnings per share
Basic net earnings per share	$ (3.99)	$ 1.40	$ 1.42	$ 1.63	$ 1.41	$ 1.56	$ 1.46	$ 1.62	$ 0.48	$ 6.04	$ 5.56
Average shares outstanding — basic									2,692.0	2,737.3	2,771.8
Potential shares exercisable under stock option plans									139.7	142.4	141.5
Less: shares repurchased under treasury stock method									(87.3)	(92.1)	(102.6)
Convertible debt shares									0.9	1.3	2.2
Average shares outstanding - diluted									2,745.3	2,788.9	2,812.9
Diluted net earnings per share	$ (3.99)	$ 1.37	$ 1.40	$ 1.61	$ 1.38	$ 1.53	$ 1.43	$ 1.59	$ 0.47	$ 5.93	$ 5.48