Restructuring Charges - Narrative (Details) - 9 months ended Sep. 30, 2016 € in Millions, $ in Millions	EUR (€)	USD ($)	USD ($)
Restructuring Cost and Reserve [Line Items]
Payments for restructuring		$ 88
ITALY
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost | €	€ 241
Payments for restructuring	209	235
Employee-related costs | ITALY
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	179		$ 201
Asset impairment costs
Restructuring Cost and Reserve [Line Items]
Payments for restructuring		0
Asset impairment costs | ITALY
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	25		28
Other exit costs
Restructuring Cost and Reserve [Line Items]
Payments for restructuring		$ 10
Other exit costs | ITALY
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	€ 37		$ 42