Financial Instruments - Long-term Debt Maturity (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2017	Jul. 03, 2016	Jul. 02, 2017	Jul. 03, 2016	Dec. 31, 2016
Financial Instruments [Abstract]
2018	$ 750		$ 750
2019	0		0
2020	500		500
2021	0		0
After 2021	3,250		3,250
Total long-term debt	4,500		4,500		$ 4,500
Interest expense, net of capitalized interest	41	$ 41	82	$ 84
Capitalized interest	$ 1	$ 1	$ 2