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Restructuring and Acquisition-Related Activities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]      
Restructuring activities $ 12 $ 28 $ 17
Acquisition-related costs 3 7 0
Total restructuring and acquisition-related activities $ 15 $ 35 17
One-time Termination Benefits [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance cost     $ 6