Long-Term Employee Benefits (Schedule of Information for Pension Plans with Projected Benefit Obligation in Excess of Plan Assets) (Details) (Pension Plan [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 28,079	$ 26,158
Accumulated benefit obligation	26,498	24,574
Fair value of plan assets	$ 18,792	$ 20,472