The computation of basic and diluted earnings per share was as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
(in millions, except shares and per share amounts)	2021		2020		2021		2020

Income (loss) from continuing operations	$	978	$	(210)	$	1,911	$	741
Income from discontinued operations, net of tax	—		320		—		320
Net income	$	978	$	110	$	1,911	$	1,061








Weighted average shares outstanding - basic	1,247,563,331		1,236,528,444		1,245,552,847		1,047,338,364
Effect of dilutive securities:
Outstanding stock options and unvested stock awards	6,154,791		—		8,711,617		9,782,025


Weighted average shares outstanding - diluted	1,253,718,122		1,236,528,444		1,254,264,464		1,057,120,389

Basic earnings (loss) per share:
Continuing operations	$	0.78	$	(0.17)	$	1.53	$	0.71
Discontinued operations	—		0.26		—		0.30
Earnings per share - basic	$	0.78	$	0.09	$	1.53	$	1.01

Diluted earnings (loss) per share:
Continuing operations	$	0.78	$	(0.17)	$	1.52	$	0.70
Discontinued operations	—		0.26		—		0.30
Earnings per share - diluted	$	0.78	$	0.09	$	1.52	$	1.00

Potentially dilutive securities:
Outstanding stock options and unvested stock awards	50,873		10,234,947		26,646		443,679
SoftBank contingent consideration (1)	48,751,557		48,751,557		48,751,557		24,375,778

As of June 30, 2021, we had authorized 100 million shares of preferred stock, with a par value of $0.00001 per share. There was no preferred stock outstanding as of June 30, 2021 and 2020. Potentially dilutive securities were not included in the computation of diluted earnings per share if to do so would have been anti-dilutive or if there was a loss from continuing operations for the period.