Restructuring Restructuring and Other Termination Costs Narrative (Details) - USD ($) $ in Millions		12 Months Ended
	Sep. 29, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring and other termination costs		$ 0	$ 6	$ 36
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent	15.00%
Workforce Reduction Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other termination costs				55
Employee Severance [Member] | Workforce Reduction Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost				47
Other Restructuring [Member] | Workforce Reduction Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost				8
Other, Including PSU's [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other termination costs				$ (19)