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Net Earnings per Share - (Narrative) (Details) - USD ($)
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Jul. 20, 2017
Earnings Per Share [Abstract]          
Antidilutive securities excluded from computation of earnings per share (in shares) 4 1 4 7  
Stock repurchase program authorized amount         $ 4,000,000,000