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Supplemental Disclosures (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			0 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Aug. 03, 2010 Kroll Divestiture [Member]	Dec. 31, 2010 Kroll Divestiture [Member]	Dec. 31, 2010 KLS [Member]	Dec. 31, 2009 KGS [Member]
Supplemental Disclosures [Line Items]
Non-cash issuance of common stock	$ 197	$ 182	$ 123
Stock-based compensation expense, equity awards	165	174	193
Cash from disposal, disposition, and/or sale transaction				$ 1,130	$ 1,130	$ 110	$ 75

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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