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Earnings Per Share
12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
The following table shows how we computed basic and diluted earnings per common share for the years ended December 31 (dollars and share data in millions):
 
 
2019
 
2018
 
2017
Net income (1)
 
$
569

 
$
189

 
$
1,140

 
 
 
 
 
 
 
Weighted average basic shares
 
296.6

 
312.9

 
328.7

Effect of dilutive securities
 
1.8

 
1.6

 
1.7

Weighted average diluted shares
 
298.4

 
314.5

 
330.4

 
 
 
 
 
 
 
Earnings per common share
 
 
 
 
 
 
Basic
 
$
1.92

 
$
0.60

 
$
3.47

Diluted
 
$
1.91

 
$
0.60

 
$
3.45


(1) As discussed in Note 1 to our consolidated financial statements, we adopted ASC 842, Leases, as of January 1, 2019. The adoption of this standard increased previously reported net income by approximately $1 million for 2018, and $15 million or $0.04 per diluted share for 2017. It did not have a material impact on our earnings per diluted share in 2018.
As discussed in Note 6 to our consolidated financial statements, JetBlue entered into various ASR agreements in 2019, 2018, and 2017 and purchased approximately 28.1 million, 19.1 million, and 18.7 million shares, respectively, for $535 million, $375 million, and $380 million, respectively. The number of shares repurchased are based on the volume weighted average prices of JetBlue's common stock during the term of the ASR agreements.