Income Taxes - Current and deferred income tax expense for continuing operations (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Current expense (benefit):
Federal									$ 3	$ 29	$ (74)
State									9	(9)	18
Non-U.S.									101	79	41
Current income tax expense, total									113	99	(15)
Deferred expense (benefit):
Federal									60	358	47
State									(5)	(14)	(7)
Non-U.S.									(6)	13	8
Deferred income tax expense, total									49	357	48
Income tax expense continuing operations, total	$ 32	$ 65	$ 36	$ 29	$ 329	$ 44	$ 62	$ 21	$ 162	$ 456	$ 33