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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule Of Stock-Based Compensation Expense
Pretax stock-based compensation costs, the tax benefit associated with stock-based compensation expense, and stock-based compensation costs capitalized are included in the following table.
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(in millions)
2015

 
2014

 
2015

 
2014

Restricted stock unit awards
$
11

 
$
11

 
$
20

 
$
22

Performance awards
8

 
5

 
13

 
10

Pretax stock-based compensation cost
$
19

 
$
16

 
$
33

 
$
32

Tax benefit associated with stock-based compensation expense
$
7

 
$
6

 
$
12

 
$
12

Stock-based compensation costs capitalized
1

 
1

 
2

 
2