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Description of Business, Basis of Presentation and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2022
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 millions202220212020
Depreciation expense$127 $139 $138 
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 millions202220212020202220212020
Beginning balance at January 1$10 $13 $13 $— $— $23 
Capitalized3 3 7 — — — 
Amortization(5)(6)(7)— — (23)
Ending balance at December 31$8 $10 $13 $— $— $— 
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 millions202220232024202520262027
Internal-use software amortization expense$5 $5 $4 $3 $3 $3 
Schedule of Basic and Diluted Earnings Per Share The components of basic and diluted earnings per share for the years ended December 31 are as follows: 
In millions, except earnings per share202220212020
Net income attributable to common stockholders$33 $147 $129 
Weighted average outstanding shares of common stock103.2 108.6 109.3 
Dilutive effect of employee stock options, restricted shares and other stock awards2.6 4.3 2.3 
Common stock and common stock equivalents105.8 112.9 111.6 
Earnings per share:
Basic$0.32 $1.35 $1.18 
Diluted$0.31 $1.30 $1.16