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Earnings Per Share
6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Earnings Per Share EARNINGS PER SHARE
The table below presents the reconciliation of the earnings and number of shares used in our calculations of basic and diluted earnings per share:
Three Months Ended Six Months Ended
(in millions, except per share amounts)June 30, 2021June 30, 2020June 30, 2021June 30, 2020
Computation of Basic Earnings Per Share
Net income (loss)$422 $(234)$411 $(203)
Shares for basic earnings per share327.1 325.6 326.9 325.5 
Basic earnings (loss) per share$1.29 $(0.72)$1.26 $(0.63)
Computation of Diluted Earnings Per Share
Net income (loss)$422 $(234)$411 $(203)
Shares for basic earnings per share327.1 325.6 326.9 325.5 
Effect of dilutive securities
Stock-based compensation (1)
2.0 — 2.1 — 
Shares for diluted earnings per share329.1 325.6 329.0 325.5 
Diluted earnings (loss) per share$1.28 $(0.72)$1.25 $(0.63)
(1) For the calculation of diluted loss per share for the three and six months ended June 30, 2020, we excluded stock-based compensation securities of 0.8 million and 1.4 million, respectively, because the effect was anti-dilutive.