Description of Business, Basis of Presentation and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

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 millions	2019		2018		2017
Depreciation expense	$	104	$	67	$	55

Schedule Of Activities Relating To Capitalized Software

The following table identifies the activity relating to capitalized software for the following periods:

	Internal-use Software									External-use Software
In millions	2019			2018			2017			2019			2018			2017
Beginning balance at January 1	$	15		$	16		$	13		$	57		$	105		$	174
Capitalized	5			6			9			—			—			—
Amortization	(7		)	(7		)	(6		)	(34		)	(48		)	(69		)
Ending balance at December 31	$	13		$	15		$	16		$	23		$	57		$	105

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:

	Actual		For the years ended (estimated)
In millions	2019		2020		2021		2022		2023		2024
Internal-use software amortization expense	$	7	$	7	$	6	$	6	$	6	$	6
External-use software amortization expense	$	34	$	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 share	2019			2018		2017
Net (loss) income attributable to common stockholders	$	(20	)	$	30	$	(67	)
Weighted average outstanding shares of common stock	114.2			119.2		125.8
Dilutive effect of employee stock options, restricted shares and other stock awards	—			2.0		—
Common stock and common stock equivalents	114.2			121.2		125.8
(Loss) earnings per share:
Basic	$	(0.18	)	$	0.25	$	(0.53	)
Diluted	$	(0.18	)	$	0.25	$	(0.53	)