Other Financial Data - Other Income (Expense) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Interest income (expense), net:
Interest expense	$ (63)	$ (55)	$ (117)	$ (109)
Interest income	5	4	13	7
Interest income (expense), net	(58)	(51)	(104)	(102)
Other:
Net periodic postretirement benefit (Note 7)	20	12	40	24
Non-U.S. pension settlement loss (Note 7)	0	(16)	0	(25)
Foreign currency gain (loss)	11	(20)	0	(22)
Gain (loss) on derivative instruments	(19)	18	(23)	11
Gains on equity method investments	0	1	1	0
Other	1	1	(2)	3
Total other income (expense)	$ 13	$ (4)	$ 16	$ (9)