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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
NUMERATOR:    
Net income $ 463 $ 339
DENOMINATOR:    
Weighted-average shares outstanding, basic 587 613
Dilutive effect of Employee stock options and restricted stock units 1 1
Adjusted weighted-average shares outstanding, diluted 588 614
NET INCOME PER SHARE:    
Basic $ 0.79 $ 0.55
Diluted $ 0.79 $ 0.55