Long-Term Employee Benefits (Schedule of Amounts Recognized in Accumulated Other Comprehensive Loss) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net loss	$ (12,164)	$ (8,640)
Prior service benefit	59	9
Pre-tax amounts recognized in accumulated other comprehensive income	(12,105)	(8,631)
Other Long-Term Employee Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net loss	(870)	(647)
Prior service benefit	1,269	1,433
Pre-tax amounts recognized in accumulated other comprehensive income	$ 399	$ 786