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Earnings Per Share, Share Repurchases and Dividends on Common Stock (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Share Repurchases
The table below summarizes the company’s share repurchases to date under the authorizations described above:
Repurchase Program
Authorization Date
 
Amount
Authorized
(in millions)
 
Total
Shares Retired
(in millions)
 
Average 
Price
Per Share(1)
 
Date Completed
 
Shares Repurchased
(in millions)
 
Year Ended December 31
2019
 
2018
 
2017
September 16, 2015
 
$
4,000

 
14.5

 
$
255.04

 

 
3.2

 
3.8

 
1.6

December 4, 2018
 
$
3,000

 
—

 
$
—

 
 
 
—

 
—

 
—

 
 
 
 
 
 
 
 
 
 
3.2

 
3.8

 
1.6


(1) 
Includes commissions paid.