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Stock Based Compensation (Tables)
12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Accrual Adjustments
 
 
 
 
 
 
 
 
 
 
 
 
2015
 
2014
 
2013
 
 
 
 
Millions
 
 
Compensation Cost included in Operation and Maintenance Expense
 
$
34

 
$
32

 
$
32

 
 
Income Tax Benefit Recognized in Consolidated Statement of Operations
 
$
14

 
$
13

 
$
13

 
 
 
 
 
 
 
 
 
 
Stock Options Activity
Changes in stock options for 2015 are summarized as follows:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Options
 
Weighted Average Exercise Price
 
Weighted Average Remaining Years Contractual Term
 
Aggregate Intrinsic Value
 
 
Outstanding as of January 1, 2015
 
2,075,850

 
$
35.35

 
 
 
 
 
 
Exercised
 
368,600

 
$
32.37

 
 
 
 
 
 
Canceled/Forfeited
 

 
$

 
 
 
 
 
 
Outstanding as of December 31, 2015
 
1,707,250

 
$
36.00

 
2.8
 
$
8,120,788

 
 
Exercisable at December 31, 2015
 
1,707,250

 
$
36.00

 
2.8
 
$
8,120,788

 
 
 
 
 
 
 
 
 
 
 
 
Activity For Options Exercised
Activity for options exercised for the years ended December 31, 2015, 2014 and 2013 is shown below:
 
 
 
 
 
 
 
 
 
 
 
 
2015
 
2014
 
2013
 
 
 
 
Millions
 
 
Total Intrinsic Value of Options Exercised
 
$
3

 
$
4

 
$
1

 
 
Cash Received from Options Exercised
 
$
12

 
$
16

 
$
7

 
 
Tax Benefit Realized from Options Exercised
 
$

 
$

 
$

 
 
 
 
 
 
 
 
 
 
Restricted Stock Units Activity
Changes in restricted stock units for the year ended December 31, 2015 are summarized as follows:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Shares
 
Weighted
Average Grant
Date Fair Value
 
Weighted Average
Remaining Years
Contractual Term
 
Aggregate
Intrinsic Value
 
 
Non-vested as of January 1, 2015
 
1,069,029

 
$
32.49

 
 
 
 
 
 
Granted
 
318,805

 
$
39.65

 
 
 
 
 
 
Vested
 
963,387

 
$
33.73

 
 
 
 
 
 
Canceled/Forfeited
 
15,940

 
$
37.28

 
 
 
 
 
 
Non-vested as of December 31, 2015
 
408,507

 
$
34.95

 
1.1
 
$
15,805,175

 
 
 
 


 
 
 
 
 
 
 
Performance Units Information
Changes in performance share units for the year ended December 31, 2015 are summarized as follows:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Shares
 
Weighted
Average
Grant Date
Fair Value
 
Weighted Average
Remaining Years
Contractual Term
 
Aggregate
Intrinsic Value
 
 
Non-vested as of January 1, 2015
 
765,633

 
$
36.86

 
 
 
 
 
 
Granted
 
337,585

 
$
41.32

 
 
 
 
 
 
Vested
 
655,201

 
$
36.82

 
 
 
 
 
 
Canceled/Forfeited
 
44,056

 
$
38.97

 
 
 
 
 
 
Non-vested as of December 31, 2015
 
403,961

 
$
40.42

 
1.6
 
$
15,629,251