Restructuring Charges and Other Costs Associated with Acquisitions and Cost-Reduction/Productivity Initiatives - Restructuring Accruals (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Restructuring Cost and Reserve [Line Items]
Balance, December 31, 2011	$ 2,517
Provision	793
Utilization and other	(1,621)	[1]
Balance, July 1, 2012	1,689	[2]
Employee Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Balance, December 31, 2011	2,425
Provision	424	[3]
Utilization and other	(1,270)	[1]
Balance, July 1, 2012	1,579	[2]
Asset Impairment Charges [Member]
Restructuring Cost and Reserve [Line Items]
Balance, December 31, 2011	0
Provision	282
Utilization and other	(282)	[1]
Balance, July 1, 2012	0	[3]
Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Balance, December 31, 2011	92
Provision	87
Utilization and other	(69)	[1]
Balance, July 1, 2012	$ 110	[2]

[1] Includes adjustments for foreign currency translation.

[2] Included in Other current liabilities ($949 million) and Other noncurrent liabilities ($740 million).

[3] For the nine months ended September 30, 2012, Provision includes additional accruals with respect to reserves for approximately 2,300 employees.