Acquisitions And Divestitures (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended					12 Months Ended			1 Months Ended	3 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Savi Technology, Inc. [Member]	Sep. 25, 2011 Savi Technology, Inc. [Member]	Dec. 31, 2010 Pacific Architects And Engineers, Inc. [Member]	Dec. 31, 2011 Pacific Architects And Engineers, Inc. [Member]	Jun. 27, 2010 Pacific Architects And Engineers, Inc. [Member]	Nov. 30, 2010 Enterprise Integration Group (EIG) [Member]	Dec. 31, 2010 Enterprise Integration Group (EIG) [Member]
Acquisitions And Divestitures [Line Items]
Acquisitions of businesses / investments in affiliates	$ 649	$ 148	$ 435
Aggregate amount of goodwill arising from acquisitions	547
Aggregate amount of goodwill arising from acquisitions that is expected to be deductible for tax purposes	113
Aggregate amount allocated to other intangibles arising from acquisitions	133
Deferred tax asset					66	182	15	96
Net benefit related to decision to sell subsidiary				40
Impairment charge						109
Selling price of EIG per definitive agreement									815
Gain on sale of EIG		184								184
Gain on sale of business divestitures (in dollars per share)										$ 0.50
Business divestiture transaction costs									17
Net proceeds from sale of EIG		798							798
Tax payment related to sale of EIG		260							260
Goodwill and other assets						143
Receivables						253
Accounts payable and accrued expenses						125
Other liabilities						$ 79