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	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 25,515	$ 27,892
Accumulated benefit obligation	24,508	26,367
Fair value of plan assets	$ 16,930	$ 18,638