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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Schedule of Share Repurchases Made Both Under and Outside of Repurchase Program

Below is a summary of the share repurchases made both under and outside of the Repurchase Program:

 

 

Year Ended December 31,

 

(in millions, except per share data)

 

2019

 

 

2018

 

 

2017

 

Number of shares of common stock repurchased

 

 

6.6

 

 

 

12.6

 

 

 

30.9

 

Aggregate purchase price

 

$

945

 

 

$

1,396

 

 

$

2,620

 

Average price per share

 

$

143.02

 

 

$

111.23

 

 

$

84.80