Risks And Uncertainties (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 segment customer business	Dec. 31, 2013 customer	Dec. 31, 2012 customer	Dec. 31, 2011
Risks and Uncertainties [Abstract]
Number of strategic business units	6
Segment Reporting, Additional Information about Entity's Reportable Segments	2
Cash and cash equivalents	$ 1,539	$ 1,642	$ 1,900	$ 1,624
Percent of revenue generated outside US	78.00%
Percent Of Revenue From Discontinued Operations Generated Outside US	99.00%
Number of customers that accounted for 10% of more of total revenue	0	0	0
Total Maritza Receivables	262
Overdue Maritza Receivables	$ 205