Expenses - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 97
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring expense	86
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 11