Long-Term Employee Benefits (Schedules of Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	$ 147	$ 100
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	66	60
Interest cost	273	292
Expected return on plan assets	(404)	(402)
Amortization of loss	209	149
Amortization of prior service (benefit) cost	(2)	1
Settlement loss	5	0
Net periodic benefit cost	147	100
Other Long-Term Employee Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	4
Interest cost	28	31
Amortization of loss	19	14
Amortization of prior service (benefit) cost	(52)	(53)
Net periodic benefit cost	$ (1)	$ (4)