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Acquisitions and Divestitures (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended			9 Months Ended						1 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010	Oct. 31, 2011 Employee	Mar. 23, 2010 Nova Analytics Corporation [Member]	Sep. 30, 2010 Godwin [Member]	Aug. 03, 2010 Godwin [Member]	Oct. 31, 2011 YSI Incorporated [Member]	Oct. 31, 2011 YSI Incorporated [Member] Trademarks [Member]	Oct. 31, 2011 YSI Incorporated [Member] Customer Relationships [Member]	Oct. 31, 2011 YSI Incorporated [Member] Proprietary technology [Member]	Sep. 30, 2010 CAS [Member]	Sep. 30, 2010 CAS [Member]	Sep. 30, 2010 CAS [Member]
Business Acquisition [Line Items]
Percentage of shares acquired										100.00%
Aggregate purchase price							$ 385		$ 580	$ 309
Aggregate fair value of finite-lived intangibles											49	40	35
Aggregate fair value of other assets acquired										56
Aggregate fair value of liabilities assumed										61
Payments to acquire businesses, net of cash acquired			309	994				994
Goodwill acquired on acquisition										190
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue (third party)															46	160
Pre Tax Operating income															4	13
After-tax gain from discontinued operations														130
Tax benefit due to difference in book and tax bases of CAS																4
Acquisitions and Divestitures (Textual) [Abstract]
Revenue	$ 2,981	$ 2,643	$ 8,765	$ 7,960	$ 101
Number of employees						390