Long-Term Employee Benefits (Schedules of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Settlement loss		$ 31
Net periodic benefit cost (credit)			$ 219	$ 320
United States Pension Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer			2,900
Curtailment loss (gain)		$ 14		63
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Re-measurement Impact, Underfunded Status				$ 2,352
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		3.74%		3.74%	4.47%
Service cost	$ 34	$ 42	67	$ 89
Interest cost	197	206	392	423
Expected return on plan assets	(309)	(331)	(617)	(669)
Amortization of loss	189	204	379	376
Amortization of prior service benefit	(1)	(1)	(2)	(3)
Curtailment loss (gain)	0	17	0	66
Settlement loss	0	37	0	38
Net periodic benefit cost (credit)	110	174	219	320
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	0	0	(4)
Pension Plan [Member] | Continuing Operations [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)	110	$ 174	219	$ 324
Other Post Employment Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		3.55%		3.55%	4.30%
Service cost	2	$ 4	4	$ 7
Interest cost	23	21	45	44
Amortization of loss	23	18	46	35
Amortization of prior service benefit	(18)	(36)	(35)	(75)
Curtailment loss (gain)	0	(3)	0	(33)
Net periodic benefit cost (credit)	$ 30	$ 4	$ 60	(22)
Defined Benefit Plan, Re-measurement Impact, Benefit Obligation				$ 265