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

12 Months Ended

Dec. 31, 2013

The following table identifies the activity relating to capitalized software:


	Internal-use Software									External-use Software
In millions	2013			2012			2011			2013			2012			2011
Beginning balance at January 1	$	12		$	11		$	11		$	161		$	129		$	105
Capitalized		6			6			5			72			75			63
Amortization		(6	)		(5	)		(5	)		(50	)		(43	)		(39	)

Ending balance at December 31	$	12		$	12		$	11		$	183		$	161		$	129

The aggregate amortization expense (actual and estimated) for internal-use and external-use software for the following periods is:


	Actual		For the year ended (estimated)
In millions	2013		2014		2015		2016		2017		2018
Internal-use software amortization expense	$	6	$	5	$	4	$	2	$	1	$	0
External-use software amortization expense	$	50	$	62	$	54	$	41	$	21	$	5

The components of basic and diluted earnings per share are as follows:


	For the year ended December 31
In millions, except earnings per share	2013		2012		2011
Net income available for common stockholders	$	377	$	419	$	353

Weighted average outstanding shares of common stock		163.4		168.2		168.1
Dilutive effect of employee stock options and restricted stock		3.0		3.5		3.8

Common stock and common stock equivalents		166.4		171.7		171.9

Earnings per share:
Basic	$	2.31	$	2.49	$	2.10
Diluted	$	2.27	$	2.44	$	2.05