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Net Earnings per Share - (Narrative) (Details) - USD ($)
shares in Millions, $ in Billions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jul. 20, 2017
Earnings Per Share [Abstract]          
Antidilutive securities excluded from computation of earnings per share (in shares) 1 4 1 4  
Stock repurchase program authorized amount         $ 4.0