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Description of Business, Basis of Presentation and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2021
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 millions202120202019
Depreciation expense$139 $138 $104 
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 millions202120202019202120202019
Beginning balance at January 1$13 $13 $15 $— $23 $57 
Capitalized3 7 5 — — — 
Amortization(6)(7)(7)— (23)(34)
Ending balance at December 31$10 $13 $13 $— $— $23 
Aggregate Amortization Expense for Internal and External-Use Software The aggregate amortization expense (actual and estimated) for internal-use software for the following periods is:
 ActualFor the years ended (estimated)
In millions202120222023202420252026
Internal-use software amortization expense$6 $5 $4 $3 $3 $3 
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 share202120202019
Net income (loss) attributable to common stockholders$147 $129 $(20)
Weighted average outstanding shares of common stock108.6 109.3 114.2 
Dilutive effect of employee stock options, restricted shares and other stock awards4.3 2.3 — 
Common stock and common stock equivalents112.9 111.6 114.2 
Earnings (loss) per share:
Basic$1.35 $1.18 $(0.18)
Diluted$1.30 $1.16 $(0.18)