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Other Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Other Expense        
Restructuring, asset impairment and related charges $ (35) $ (79) $ (57) $ (79)
Strategic transaction costs (13)   (19)  
Other expense, net (44) (73) (59) (70)
Other Expenses.        
Other Expense        
Restructuring, asset impairment and related charges (35) (71) (57) (71)
Strategic transaction costs (13)   (19)  
Foreign currency exchange gain (loss) 2 1 10 (1)
Other Income 2 (3) 7 2
Other expense, net $ (44) $ (73) $ (59) $ (70)