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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2016
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
 
Nine Months Ended
 
September 30,
 
September 30,
(in millions)
2016

 
2015

 
2016

 
2015

Restricted stock unit awards
$
8

 
$
9

 
$
25

 
$
29

Performance awards
4

 
5

 
14

 
18

Pretax stock-based compensation cost
$
12

 
$
14

 
$
39

 
$
47

Tax benefit associated with stock-based compensation expense
$
5

 
$
6

 
$
14

 
$
18

Stock-based compensation costs capitalized
—

 
1

 
2

 
3