Inventories (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Raw materials, components and sub-assemblies	$ 351		$ 184
Work in process	330		98
Finished goods	198		107
Total	879	$ 926	$ 389
General and Administrative Costs in Inventory, Amount Remaining	31
General and Administrative Costs in Inventory, Amount Incurred	1,181
General and Administrative Costs in Inventory, Amount Charged to Expense	$ 1,221