Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule Of Stock-Based Compensation Expense

	Three Months Ended March 31,
(in millions)	2013		2012
Stock Options	$	2	$	2
Restricted Stock Unit Awards		13		8
Performance Awards		11		(2)
Total	$	26	$	8
Tax benefit associated with stock-based compensation expense	$	10	$	3
Stock-based compensation costs capitalized		1		―