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Restructuring Charges/Other - Restructuring Reserve (Details)
$ in Millions
6 Months Ended
Jun. 30, 2016
USD ($)
Restructuring And Related Activities [Abstract]  
Balance, December 31, 2015 $ 32
Restructuring charges 4
Payments (7)
Non-cash items (4) [1]
Balance, June 30, 2016 $ 25
[1] Reflects charges for impacts of accelerated depreciation and changes in exchange rates.