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Restructuring of Operations - Restructuring Charges and Related Payments and Adjustments (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Mar. 31, 2013
Jun. 30, 2014
Restructuring Reserve [Roll Forward]      
Beginning balance $ 23   $ 25
Charges to restructuring 3   12
Cash payments (5)   (16)
Ending Balance 21   21
Employee Termination Benefits [Member]
     
Restructuring Reserve [Roll Forward]      
Beginning balance 13   14
Charges to restructuring 1   8
Cash payments (3)   (11)
Ending Balance 11   11
Exit Costs [Member]
     
Restructuring Reserve [Roll Forward]      
Beginning balance 10   11
Charges to restructuring 2   4
Discontinued operations charges   1  
Cash payments (2)   (5)
Ending Balance $ 10   $ 10