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Restructuring Charges (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Restructuring charges $ 14 $ 12 $ 38 $ 45
Restructuring and Related Cost, Expected Number of Positions Eliminated as a Percent of Total Workforce     5.00%  
Severance and Related Costs
       
Restructuring charges     17  
Contractual Obligations and Other
       
Restructuring charges     $ 21