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Restructuring and Other (Restructuring Charges by Action/Type) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Restructuring Reserve [Abstract]        
Asset impairments and sales $ (5) $ (5) $ (7) $ 1
Restructuring 2 1 3 1
Transaction costs 0 1 0 15
Other costs 0 0 3 0
Restructuring and other $ (3) $ (3) $ (1) $ 17