Summary Of Business Segment Data (Parenthetical) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Net (loss)/gain on disposal of discontinued operations, taxes	$ 0	$ (2)	$ 4

Amount of tax expense or benefit on gain (loss), not previously recognized, resulting from the sale of a business component.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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