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Asset Impairment and Exit Costs (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Restructuring Cost and Reserve [Line Items]        
Separation programs $ 0 $ 8 $ 0 $ 16
Cash spent (7) (7) (12) (20)
Effect on future cash flows amount     16  
Contract Termination [Member]
       
Restructuring Cost and Reserve [Line Items]        
Contract termination charges $ 5 $ 0 $ 8 $ 0