Long-Term Employee Benefits (Schedules of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)	$ 109	$ 146
Defined Benefit Plan Re-measurement Impact, Underfunded Status		1,191
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	33	47
Interest cost	195	217
Expected return on plan assets	(308)	(338)
Amortization of loss	190	172
Amortization of prior service benefit	(1)	(2)
Curtailment (gain) loss, net	0	49
Settlement loss	0	1
Net periodic benefit cost (credit)	109	146
Pension Plan [Member] | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)	0	(4)
Pension Plan [Member] | Continuing Operations [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)	109	150
Other Post Employment Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	3
Interest cost	22	23
Amortization of loss	23	17
Amortization of prior service benefit	(17)	(39)
Curtailment (gain) loss, net	0	(30)
Net periodic benefit cost (credit)	$ 30	$ (26)