Long-Term Employee Benefits (Summarized Information on Pension and Other Long-Term Benefits Plans) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016		Dec. 31, 2015
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at beginning of year		$ 17,497
Benefits paid		(550)
Fair value of plan assets at end of year		16,656		$ 17,497
Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Other liabilities (Note 14)		(8,100)		(8,478)
Other Post Employment Benefit Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Employer contributions		218		237
Other liabilities (Note 14)		(2,554)		(2,524)
Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Funded status of plan		(8,175)		(8,597)
Net amount recognized		(8,175)		(8,597)
Pension Plan [Member] | Change In Benefit Obligation [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year		26,094		29,669
Service cost		174		232
Interest cost		800		1,084
Plan participants' contributions		18		19
Actuarial loss (gain)		460		(1,404)
Amendments		0		0
Benefits paid		(2,374)	[1]	(1,761)
Effect of foreign exchange rates		(348)		(456)
Defined benefit plan acquisitions divestitures and other activity		(7)		52
Spin-off of Chemours		0		(1,237)
Benefit obligation at end of year		24,831		26,094
Pension Plan [Member] | Change In Plan Assets [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at beginning of year		17,497		20,446
Plan participants' contributions		18		19
Actual gain on plan assets		1,219		88
Employer contributions		535		308
Benefits paid		(2,374)	[1]	(1,761)
Defined benefit plan acquisitions divestitures and other activity		0		47
Effect of foreign exchange rates		(239)		(330)
Spin-off of Chemours		0		1,226
Fair value of plan assets at end of year		16,656		17,497
Pension Plan [Member] | United States Pension Plan of US Entity [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Funded status of plan		(6,391)		(6,662)
Pension Plan [Member] | Foreign Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Funded status of plan		(674)		(748)
Pension Plan [Member] | All Other Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Funded status of plan	[2]	(1,110)		(1,187)
Pension Plan [Member] | Other assets [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Other assets		3		11
Pension Plan [Member] | Other accrued liabilities [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Other accrued liabilities (Note 12)		(78)		(130)
Pension Plan [Member] | Other liabilities [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Other liabilities (Note 14)		(8,100)		(8,478)
Other Post Employment Benefit Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Funded status of plan		(2,829)		(2,758)
Net amount recognized		(2,829)		(2,758)
Other Post Employment Benefit Plans [Member] | Change In Benefit Obligation [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year		2,758		2,889
Service cost		11		15
Interest cost		87		112
Plan participants' contributions		36		45
Actuarial loss (gain)		153		(4)
Amendments		(28)		0
Benefits paid		(254)		(282)
Effect of foreign exchange rates		1		(6)
Defined benefit plan acquisitions divestitures and other activity		(65)		0
Spin-off of Chemours		0		(11)
Benefit obligation at end of year		2,829		2,758
Other Post Employment Benefit Plans [Member] | Change In Plan Assets [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at beginning of year		0		0
Plan participants' contributions		36		45
Actual gain on plan assets		0		0
Employer contributions		218		237
Benefits paid		(254)		(282)
Defined benefit plan acquisitions divestitures and other activity		0		0
Effect of foreign exchange rates		0		0
Spin-off of Chemours		0		0
Fair value of plan assets at end of year		0		0
Other Post Employment Benefit Plans [Member] | United States Pension Plan of US Entity [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Funded status of plan		0		0
Other Post Employment Benefit Plans [Member] | Foreign Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Funded status of plan		0		0
Other Post Employment Benefit Plans [Member] | All Other Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Funded status of plan		(2,829)		(2,758)
Other Post Employment Benefit Plans [Member] | Other assets [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Other assets		0		0
Other Post Employment Benefit Plans [Member] | Other accrued liabilities [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Other accrued liabilities (Note 12)		(275)		(234)
Other Post Employment Benefit Plans [Member] | Other liabilities [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Other liabilities (Note 14)		$ (2,554)		$ (2,524)

[1] 2016 benefits paid includes about $550 of lump sum benefits associated with the limited-time opportunity provided to certain separated, vested participants in the principal U.S. pension plan. See further discussion above.

[2] Includes pension plans maintained around the world where funding is not customary.