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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2017
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
 
Six Months Ended
 
June 30,
 
June 30,
(in millions)
2017

 
2016

 
2017

 
2016

Restricted stock unit awards
$
12

 
$
10

 
$
20

 
$
17

Performance awards
6

 
5

 
13

 
10

Pretax stock-based compensation cost
$
18

 
$
15

 
$
33

 
$
27

Tax benefit associated with stock-based compensation expense
$
7

 
$
5

 
$
12

 
$
9

Stock-based compensation costs capitalized
—

 
1

 
1

 
2