Long-Term Employee Benefits (Schedules of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	$ 146	$ 147
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	47	66
Interest cost	217	273
Expected return on plan assets	(338)	(404)
Amortization of loss	172	209
Amortization of prior service benefit	(2)	(2)
Curtailment (gain) loss	49	0
Settlement loss	1	5
Net periodic benefit cost	$ 146	147
Defined benefit plan, discount rate	4.13%		4.47%
Defined benefit plan, re-measurement impact, underfunded status	$ 1,191
Other Long-Term Employee Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	4
Interest cost	23	28
Amortization of loss	17	19
Amortization of prior service benefit	(39)	(52)
Curtailment (gain) loss	(30)	0
Net periodic benefit cost	$ (26)	(1)
Defined benefit plan, discount rate	3.94%		4.30%
Defined benefit plan, re-measurement impact, benefit obligation	$ 124
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member] | Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	(4)	1
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member] | Other Long-Term Employee Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	0	1
Continuing Operations [Member] | Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	150	146
Continuing Operations [Member] | Other Long-Term Employee Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	$ (26)	$ (2)