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Earnings (Loss) Per Share (Tables)
9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Schedule of earnings per share, basic and diluted
The following table shows how we computed basic and diluted earnings per common share for the three and nine months ended September 30, 2021 and 2020 (dollars and share data in millions):
Three Months Ended September 30,Nine Months Ended September 30,
 2021202020212020
Net income (loss)$130 $(393)$(53)$(981)
Weighted average basic shares318.0 272.4 317.3 274.3 
Effect of dilutive securities3.3 — — — 
Weighted average diluted shares321.3 272.4 317.3 274.3 
Earnings (loss) per common share:
Basic$0.41 $(1.44)$(0.17)$(3.58)
Diluted$0.40 $(1.44)$(0.17)$(3.58)