Long-Term Employee Benefits (Schedule of Information for Pension Plans with Accumulated 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	$ 27,892	$ 25,350
Accumulated benefit obligation	26,367	23,906
Fair value of plan assets	$ 18,638	$ 19,744