Long-Term Employee Benefits (Schedule of Amounts Recognized in Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net loss	$ (10,280)	$ (10,803)
Prior service benefit	17	54
Pre-tax amounts recognized in accumulated other comprehensive loss	(10,263)	(10,749)
Other Post Employment Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net loss	(830)	(787)
Prior service benefit	281	811
Pre-tax amounts recognized in accumulated other comprehensive loss	$ (549)	$ 24