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Restructuring and Other (Restructuring Charges by Action/Type) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Restructuring Reserve [Abstract]    
Asset impairments and sales $ (6) $ (2)
Restructuring 2 0
Other costs 0 4
Restructuring and other $ (4) $ 2