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Restructuring and Other (Restructuring Charges by Action/Type) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Restructuring Reserve [Abstract]        
Asset impairments and sales $ 0 $ (5) $ (6) $ (7)
Restructuring 2 2 4 3
Other costs 16 0 16 3
Restructuring and other $ 18 $ (3) $ 14 $ (1)