Long-Term Employee Benefits (Summarized Information on Pension and Other Long-Term Benefits Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of year	$ 20,446		$ 20,614
Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Funded status of plan	(9,223)		(5,675)
Other liabilities (Note 14)	(9,167)		(5,575)
Net amount recognized	(9,223)		(5,675)
Pension Plan [Member] | Change In Benefit Obligation [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	26,289		29,179
Service cost	241		271
Interest cost	1,162		1,088
Plan participants' contributions	21		23
Actuarial loss (gain)	3,672		(2,104)
Benefits paid	(1,651)		(1,626)
Amendments	(44)		(62)
Net effects of acquisitions/divestitures	(21)		(480)
Benefit obligation at end of year	29,669		26,289
Pension Plan [Member] | Change In Plan Assets [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Plan participants' contributions	21		23
Benefits paid	(1,651)		(1,626)
Net effects of acquisitions/divestitures	(12)		(209)
Fair value of plan assets at beginning of year	20,614		19,399
Actual gain on plan assets	1,163		2,714
Employer contributions	311		313
Fair value of plan assets at end of year	20,446		20,614
Pension Plan [Member] | United States Pension Plan of US Entity [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Funded status of plan	(7,072)		(3,546)
Pension Plan [Member] | Foreign Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Funded status of plan	(709)		(686)
Pension Plan [Member] | All Other Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Funded status of plan	(1,442)	[1]	(1,443)	[1]
Pension Plan [Member] | Other assets [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Other assets	64		11
Pension Plan [Member] | Other accrued liabilities [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Other accrued liabilities (Note 12)	(120)		(111)
Pension Plan [Member] | Other liabilities [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Other liabilities (Note 14)	(9,167)		(5,575)
Other Long-Term Employee Benefit Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Employer contributions	233		207
Funded status of plan	(2,889)		(2,754)
Other liabilities (Note 14)	(2,666)		(2,530)
Net amount recognized	(2,889)		(2,754)
Other Long-Term Employee Benefit Plans [Member] | Change In Benefit Obligation [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	2,754		3,532
Service cost	17		29
Interest cost	121		130
Plan participants' contributions	37		33
Actuarial loss (gain)	280		(515)
Benefits paid	(270)		(240)
Amendments	(50)		(211)	[2]
Net effects of acquisitions/divestitures	0		(4)
Benefit obligation at end of year	2,889		2,754
Other Long-Term Employee Benefit Plans [Member] | Change In Plan Assets [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Plan participants' contributions	37		33
Benefits paid	(270)		(240)
Net effects of acquisitions/divestitures	0		0
Fair value of plan assets at beginning of year	0		0
Actual gain on plan assets	0		0
Employer contributions	233		207
Fair value of plan assets at end of year	0		0
Other Long-Term Employee 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 Long-Term Employee Benefit Plans [Member] | Foreign Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Funded status of plan	0		0
Other Long-Term Employee Benefit Plans [Member] | All Other Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Funded status of plan	(2,889)		(2,754)
Other Long-Term Employee Benefit Plans [Member] | Other assets [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Other assets	0		0
Other Long-Term Employee Benefit Plans [Member] | Other accrued liabilities [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Other accrued liabilities (Note 12)	(223)		(224)
Other Long-Term Employee Benefit Plans [Member] | Other liabilities [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Other liabilities (Note 14)	$ (2,666)		$ (2,530)

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

[2] Primarily due to amendments in 2013 to the company's U.S. parent company retiree life insurance plan for employees retiring on and after January 1, 2015 and subsidiaries retiree health care plans.