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Employee Benefit Benefits and Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award  
Schedule of non-cash compensation expense and capitalized non-cash compensation
The following table summarizes non-cash compensation expense and capitalized non-cash compensation for each of the three years ended December 31, 2015, 2014 and 2013 (dollars in millions):

 
 
2015
 
2014
 
2013
OSOs
 
$
6

 
$
8

 
$
21

Restricted Stock Units
 
65

 
34

 
38

Performance Restricted Stock Units
 
35

 
14

 
—

401(k) Match Expense
 
36

 
23

 
24

Restricted Stock Unit Bonus Grant
 
—

 
(5
)
 
59

Management Incentive and Retention Plan
 
—

 
—

 
10

 
 
142

 
74

 
152

Capitalized Non-Cash Compensation
 
(1
)
 
(1
)
 
(1
)
 
 
$
141

 
$
73

 
$
151
Schedule of OSO valuation assumptions
The Company believes that given the relative short life of the OSOs and the other variables used in the model, the modified Black-Scholes model provides a reasonable estimate of the fair value of the OSO units at the time of grant.

 
 
Year Ended December 31, 2013
S&P 500 Expected Dividend Yield Rate
 
2.24%
Expected Life
 
3 years
S&P 500 Expected Volatility Rate
 
19%
Level 3 Common Stock Expected Volatility Rate
 
39%
Expected S&P 500 Correlation Factor
 
0.44
Calculated Theoretical Value
 
101%
Estimated Forfeiture Rate
 
15%
Schedule of restricted stock and restricted stock units
The changes in nonvested restricted stock and restricted stock units are shown in the following table:
 
 
Number
 
Weighted Average
Grant Date
Fair Value
Nonvested at January 1, 2013
 
3,636,976

 
$
24.71

Stock and units granted
 
1,617,592

 
$
21.26

Lapse of restrictions
 
(1,841,757
)
 
$
25.19

Stock and units forfeited
 
(488,461
)
 
$
23.10

Nonvested at December 31, 2013
 
2,924,350

 
$
22.77

Stock and units granted
 
1,650,772

 
$
43.48

Lapse of restrictions
 
(1,150,080
)
 
$
22.92

Stock and units forfeited
 
(206,305
)
 
$
27.14

Nonvested at December 31, 2014
 
3,218,737

 
$
32.95

Stock and units granted
 
2,087,942

 
$
50.60

Lapse of restrictions
 
(1,194,519
)
 
$
31.70

Stock and units forfeited
 
(358,227
)
 
$
44.25

Nonvested at December 31, 2015
 
3,753,933

 
$
42.09
Schedule OSO activity
Transactions involving OSO units awarded are summarized in the table below. The Option Price Per Unit identified in the table below represents the initial strike price, as determined on the day prior to the OSO grant date for those grants.
 
 
Units
 
Initial Strike Price Per Unit
 
Weighted
Average
Initial
Strike
Price
 
Aggregate
Intrinsic
Value
 
Weighted
Average
Remaining
Contractual
Term (years)
 
 
 
 
 
 
 
 
 
 
(in millions)
 
 
Balance January 1, 2013
 
2,066,419

 
$
14.10

-
$
36.60

 
$
23.40

 
$
6.6

 
1.73
OSOs granted
 
748,481

 
$
20.29

-
$
26.69

 
$
22.64

 
 
 
 
OSOs forfeited
 
(271,883
)
 
$
14.10

-
$
36.60

 
$
22.33

 
 
 
 
OSOs expired
 
(286,924
)
 
$
16.35

-
$
24.30

 
$
21.48

 
 
 
 
OSOs exercised
 
(107,228
)
 
$
14.10

-
$
14.10

 
$
14.10

 
 
 
 
Balance December 31, 2013
 
2,148,865

 
$
14.10

-
$
36.60

 
$
23.99

 
$
31.6

 
1.46
OSOs granted
 
—

 
$
—

-
$
—

 
$
—

 
 
 
 
OSOs forfeited
 
(52,901
)
 
$
16.99

-
$
27.53

 
$
22.99

 
 
 
 
OSOs expired
 
(106,844
)
 
$
36.60

-
$
36.60

 
$
36.60

 
 
 
 
OSOs exercised
 
(771,251
)
 
$
14.70

-
$
27.53

 
$
24.26

 
 
 
 
Balance December 31, 2014
 
1,217,869

 
$
16.99

-
$
27.53

 
$
22.76

 
$
88.0

 
0.90
OSOs granted
 
—

 
$
—

-
$
—

 
$
—

 
 
 
 
OSOs forfeited
 
(12,945
)
 
$
20.29

-
$
26.69

 
$
22.81

 
 
 
 
OSOs expired
 
—

 
$
—

-
$
—

 
$
—

 
 
 
 
OSOs exercised
 
(589,944
)
 
$
22.15

-
$
22.97

 
$
22.32

 
 
 
 
Balance December 31, 2015
 
614,980

 
$
20.29

-
$
26.69

 
$
22.77

 
$
48.5

 
0.37
Schedule of OSO by exercise price range
 
 
 
 
OSO Units Outstanding
at December 31, 2015
 
OSO units Exercisable
at December 31, 2015
Range of Exercise Prices
 
Number
Outstanding
 
Weighted
Average
Remaining
Life (years)
 
Weighted
Average
Initial
Strike Price
 
Number
Exercisable
 
Weighted
Average
Initial
Strike Price
$
20.29

-
$
26.69

 
614,980

 
0.37
 
$
22.77

 
—

 
$
—
Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block]
The changes in nonvested performance restricted stock units are shown in the following table:

 
 
Number
 
Weighted Average
Grant Date
Fair Value
Nonvested at January 1, 2014
 
—

 
$
—

Stock and units granted
 
605,111

 
$
39.30

Lapse of restrictions
 
(1,750
)
 
$
39.14

Stock and units forfeited
 
(35,480
)
 
$
39.14

Nonvested at December 31, 2014
 
567,881

 
$
39.31

Stock and units granted
 
713,657

 
$
53.82

Lapse of restrictions
 
—

 
$
—

Stock and units forfeited
 
(53,073
)
 
$
49.25

Nonvested at December 31, 2015
 
1,228,465

 
$
47.31
Management Incentive and Retention Plan  
Share-based Compensation Arrangement by Share-based Payment Award  
Schedule of restricted stock and restricted stock units
A summary of the retention restricted stock units granted under the MIRP is shown in the following table:
 
 
Number
 
Weighted Average
Grant Date
Fair Value
Nonvested at January 1, 2013
 
465,000

 
$
25.92

Stock and units granted
 
—

 
$
—

Lapse of restrictions
 
(270,000
)
 
$
25.92

Stock and units forfeited
 
—

 
$
—

Nonvested at December 31, 2013
 
195,000

 
$
25.92

Stock and units granted
 
—

 


Lapse of restrictions
 
(195,000
)
 
$
25.92

Stock and units forfeited
 
—

 


Nonvested at December 31, 2014
 
—