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, 2011		Dec. 31, 2010		Dec. 31, 2009
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of year	$ 17,927		$ 18,580
Discount From Drug Manufacturers In Coverage Gap			50.00%
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Other assets	4		4
Other accrued liabilities (Note 12)	(107)		(124)
Other liabilities (Note 14)	(9,186)		(5,401)
Net amount recognized	(9,289)		(5,521)
Other Long-Term Employee Benefit Plans Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Service cost	33		29		31
Interest cost	212		238		245
Other assets	0		0
Other accrued liabilities (Note 12)	(316)		(319)
Other liabilities (Note 14)	(4,063)		(3,670)
Net amount recognized	(4,379)		(3,989)
U.S. Plans | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Funded status of plan	(6,894)		(3,408)
U.S. Plans | Other Long-Term Employee Benefit Plans Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Funded status of plan	0		0
Foreign Pension Plans, Defined Benefit [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Funded status of plan	(901)		(652)
Foreign Pension Plans, Defined Benefit [Member] | Other Long-Term Employee Benefit Plans Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Funded status of plan	0		0
All Other Plans [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Funded status of plan	(1,494)	[1]	(1,461)	[1]
All Other Plans [Member] | Other Long-Term Employee Benefit Plans Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Funded status of plan	(4,379)		(3,989)
Change In Benefit Obligation [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	23,924		22,770
Service cost	249		207
Interest cost	1,253		1,262
Plan participants' contributions	21		18
Actuarial loss (gain)	3,062		1,218
Benefits paid	(1,610)		(1,584)
Amendments	2		0
Net effects of acquisitions/divestitures	182		33
Benefit obligation at end of year	27,083		23,924
Change In Benefit Obligation [Member] | Other Long-Term Employee Benefit Plans Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	3,989		4,132
Service cost	33		29
Interest cost	212		238
Plan participants' contributions	112		114
Actuarial loss (gain)	441		96
Benefits paid	(424)		(435)
Amendments	11		(189)	[2]
Net effects of acquisitions/divestitures	5		4
Benefit obligation at end of year	4,379		3,989
Change In Plan Assets [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at beginning of year	18,403		17,143
Actual gain on plan assets	471		2,015
Employer contributions	341		782
Plan participants' contributions	21		18
Benefits paid	1,610		1,584
Net effects of acquisitions/divestitures	168		29
Fair value of plan assets at end of year	17,794		18,403
Change In Plan Assets [Member] | Other Long-Term Employee Benefit Plans Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at beginning of year	0		0
Actual gain on plan assets	0		0
Employer contributions	312		321
Plan participants' contributions	112		114
Benefits paid	424		435
Net effects of acquisitions/divestitures	0		0
Fair value of plan assets at end of year	$ 0		$ 0

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

[2] Change is primarily due to an amendment in 2010 to the company's U.S. parent company retiree medical plan to take advantage of a 50 percent discount from brand name drug manufacturers in the "coverage gap" portion of the Medicare Part D plan. The plan amendment has no effect on current or future retirees' coverage.