Restructuring - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) Positions	Dec. 31, 2014 USD ($) Positions
Restructuring Plan, 2015 [Member]
Restructuring Cost and Reserve [Line Items]
Workforce reduction, positions | Positions	550
Initial Charge Recorded	$ 63
Restructuring charges paid	13
Restructuring Plan, 2014 [Member]
Restructuring Cost and Reserve [Line Items]
Workforce reduction, positions | Positions		590
Reserves reversed	7
Initial Charge Recorded		$ 86
Restructuring charges paid	$ 64	$ 9