Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2013

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

Schedule Of Stock-Based Compensation Expense

	Three Months Ended September 30,					Nine Months Ended September 30,
(in millions)			2013		2012			2013		2012
Stock options		$	―	$	―		$	2	$	2
Restricted stock unit awards			10		16			36		30
Performance awards			7		16			25		19
Total		$	17	$	32		$	63	$	51
Tax benefit associated with stock-based compensation expense		$	6	$	13		$	24	$	20
Stock-based compensation costs capitalized			1		―			3		1