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Description of Business, Basis of Presentation and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2020
Description of Business, Basis of Presentation and Significant Accounting Policies [Abstract]  
Schedule of Depreciation Expense Total depreciation expense on the Company’s property and equipment for December 31 was as follows:
In millions202020192018
Depreciation expense$138 $104 $67 
Schedule of Activities Relating to Capitalized Software
The following table identifies the activity relating to capitalized software for the following periods:
 Internal-use SoftwareExternal-use Software
In millions202020192018202020192018
Beginning balance at January 1$13 $15 $16 $23 $57 $105 
Capitalized7 5 6 — — — 
Amortization(7)(7)(7)(23)(34)(48)
Ending balance at December 31$13 $13 $15 $— $23 $57 
Aggregate Amortization Expense for Internal and External-Use Software
The aggregate amortization expense (actual and estimated) for internal-use and external-use software for the following periods is:
 ActualFor the years ended (estimated)
In millions202020212022202320242025
Internal-use software amortization expense$7 $6 $6 $6 $6 $6 
External-use software amortization expense$23 $— $— $— $— $— 
Schedule of Basic and Diluted Earnings Per Share The components of basic and diluted earnings (loss) per share for the years ended December 31 are as follows: 
In millions, except earnings (loss) per share202020192018
Net income (loss) attributable to common stockholders$129 $(20)$30 
Weighted average outstanding shares of common stock109.3 114.2 119.2 
Dilutive effect of employee stock options, restricted shares and other stock awards2.3 — 2.0 
Common stock and common stock equivalents111.6 114.2 121.2 
Earnings (loss) per share:
Basic$1.18 $(0.18)$0.25 
Diluted$1.16 $(0.18)$0.25