Retirement Plans - Other information on retirement plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Retirement Plans
Percentage of eligible compensation contributed by employer to Retirement Account Plan	2.00%
Additional percentage of eligible compensation contributed annually by employer to defined contribution plan for employees hired after January 1, 2010	4.00%
Cost recognized for defined contribution plans	$ 110	$ 103	$ 99
Portion of contribution related to Retirement Account Plan	$ 10	$ 12	$ 16