Retirement Plans (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 03, 2015
Pension Benefits
Amortized amount from accumulated other comprehensive income
Net actuarial loss	$ 156
Prior service cost (credit)	16
Net periodic benefit cost	172
Postretirement Benefits Other than Pensions
Amortized amount from accumulated other comprehensive income
Net actuarial loss	2
Prior service cost (credit)	(25)
Net periodic benefit cost	$ (23)