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Net Earnings per Share - (Narrative) (Details) - shares
shares in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share [Abstract]    
Antidilutive securities excluded from computation of earnings per share (less than 1 million for 3 months ended March 31, 2017) (in shares) 1 11