Accumulated Other Comprehensive Income Reclassifications (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cost of products	$ 503	$ 445
Cost of services	538	484
Selling, general and administrative expenses	229	191
Research and development expenses	55	46
Income from continuing operations	64	60
Income tax expense (benefit)	(2)	(7)
Total reclassifications, net of tax	61	50
Reclassification out of Accumulated Other Comprehensive Income
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cost of products	(1)	0
Cost of services	(8)	1
Selling, general and administrative expenses	(5)	(1)
Research and development expenses	(2)	(1)
Income from continuing operations	(16)	(1)
Income tax expense (benefit)	5	1
Total reclassifications, net of tax	(11)	0
Reclassification out of Accumulated Other Comprehensive Income | Actuarial losses recognized
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cost of services	2	3
Selling, general and administrative expenses		1
Income from continuing operations	2	4
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service benefit
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cost of products	(1)	0
Cost of services	(10)	(2)
Selling, general and administrative expenses	(5)	(2)
Research and development expenses	(2)	(1)
Income from continuing operations	$ (18)	$ (5)