Business Group Information - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014 Segment		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Number of business groups	4
Revenues	$ 30,852,000,000		$ 30,930,000,000		$ 30,992,000,000
Entity wide disclosure on geographic areas long lived assets in individual foreign countries percentage	6.00%		6.00%
Information Systems and Technology
Segment Reporting Information [Line Items]
Goodwill and Intangible Asset Impairment					2,100,000,000
Revenues	9,159,000,000	[1]	10,268,000,000	[1]	10,017,000,000	[1]
International Operations [Member]
Segment Reporting Information [Line Items]
Revenues	$ 3,600,000,000		$ 3,300,000,000		$ 4,300,000,000

[1] Operating earnings in 2012 in our Information Systems and Technology group include $2.1 billion of goodwill and intangible asset impairment charges (see Note B for further discussion).