Stock-Based Compensation (Tables)

3 Months Ended

6 Months Ended

Jun. 30, 2013

Jun. 30, 2013

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

Schedule Of Stock-Based Compensation Expense

	Three Months Ended June 30,
(in millions)			2013		2012
Restricted Stock Unit Awards		$	12	$	6
Performance Awards			7		5
Total		$	19	$	11
Tax benefit associated with stock-based compensation expense		$	8	$	4
Stock-based compensation costs capitalized			1		1

	Six Months Ended June 30,
(in millions)			2013		2012
Stock Options		$	2	$	2
Restricted Stock Unit Awards			26		14
Performance Awards			18		3
Total		$	46	$	19
Tax benefit associated with stock-based compensation expense		$	18	$	7
Stock-based compensation costs capitalized			2		1