Acquisitions, Divestitures And Discontinued Operations (Summary Of Assets And Liabilities Classified As Discontinued Operations) (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Current assets of discontinued operations	$ 2	$ 5
Current liabilities of discontinued operations	13	15
Non-current liabilities of discontinued operations	24	25
Primary Accelerators [Member]
Trade and miscellaneous receivables, net	2	5
Current assets of discontinued operations	2	5
Accounts payable and accrued liabilities	13	15
Current liabilities of discontinued operations	13	15
Other liabilities	24	25
Non-current liabilities of discontinued operations	24	25
Total liabilities	37	40
Parent Company [Member]
Current assets of discontinued operations	0	0
Current liabilities of discontinued operations	0	0
Non-current liabilities of discontinued operations	$ 0	$ 0