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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
 
Year Ended December 31
 
Unrecognized Stock-Based Compensation Expense
 
2015
 
2014
 
2013
 
December 31, 2015
 
(Dollars in Millions)
Performance based share units
$
12

 
$
14

 
$
13

 
$
4

Restricted stock units
4

 
6

 
12

 
4

Stock options
1

 
—

 
—

 
1

Restricted stock awards
—

 
—

 
3

 
—

Stock appreciation rights
—

 
1

 
1

 
—

  Total stock-based compensation expense
$
17

 
$
21

 
$
29

 
$
9
Schedule of Share-based Awards, Performance Shares, Valuation Assumptions [Table Text Block]
Weighted average assumptions used to estimate the fair value of PSUs granted during the years ended as of December 31, 2015 and 2014 are as follows:
 
Year Ended December 31
 
2015
 
2014
Expected volatility
33.0
%
 
39.6
%
Risk-free rate
0.95
%
 
0.79
%
Expected dividend yield
—
%
 
—
%
Schedule of Stock Based Compensation Activity, Performance Based Stock Units, during the period [Table Text Block]
A summary of activity for PSUs, including award grants, vesting and forfeitures is provided below.
 
PSUs
 
Weighted Average Grant Date Fair Value
 
 
(In Thousands)
 
 
Non-vested at December 31, 2012
1,254

 
$
33.32

Forfeited
(265
)
 
32.33

Non-vested at December 31, 2013
989

 
33.59

Granted
30

 
90.45

Forfeited
(25
)
 
35.92

Non-vested at December 31, 2014
994

 
35.25

Granted
44

 
104.81

Vested
(255
)
 
36.57

Forfeited
(121
)
 
43.21

Non-vested at December 31, 2015
662

 
$
37.92
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
 
RSAs
 
RSUs
 
Weighted Average Grant Date Fair Value
 
(In Thousands)
 
 
Non-vested at December 31, 2012
228

 
403

 
$
51.20

Granted
—

 
19

 
74.55

Vested
(199
)
 
(200
)
 
54.76

Forfeited
(10
)
 
(61
)
 
44.88

Non-vested at December 31, 2013
19

 
161

 
48.26

  Granted
—

 
16

 
84.58

Vested
(10
)
 
(80
)
 
53.68

Forfeited
—

 
(6
)
 
52.49

Non-vested at December 31, 2014
9

 
91

 
54.64

  Granted
—

 
55

 
103.66

  Vested
(9
)
 
(50
)
 
54.47

  Forfeited
—

 
(10
)
 
71.33

Non-vested at December 31, 2015
—

 
86

 
$
84.26
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
 
Stock Options
 
SARs
 
2015
 
2014
 
2013
 
2015
 
2014
 
2013
Expected term (in years)
5.00

 
5.00

 
N/A
 
4.41

 
5.00

 
4.45

Expected volatility
38.19
%
 
43.61
%
 
N/A
 
37.19
%
 
43.61
%
 
42.14
%
Risk-free interest rate
1.60
%
 
1.72
%
 
N/A
 
1.63
%
 
1.72
%
 
1.51
%
Expected dividend yield
—
%
 
—
%
 
N/A
 
—
%
 
—
%
 
—
%
Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity
A summary of activity for Stock Options and SARs, including award grants, vesting and forfeitures is provided below.
 
Stock Options
 
Weighted Average
Exercise Price
 
SARs
 
Weighted Average
Exercise Price
 
(In Thousands)
 
 
 
(In Thousands)
 
 
December 31, 2012
362

 
$
67.13

 
98

 
$
68.36

Granted
—

 
—

 
—

 
—

Exercised
(36
)
 
55.88

 
(3
)
 
61.42

Forfeited or expired
(120
)
 
67.81

 
(19
)
 
66.80

December 31, 2013
206

 
68.74

 
76

 
69.06

Granted
32

 
84.67

 
11

 
84.67

Exercised
(160
)
 
70.88

 
(40
)
 
71.15

Forfeited or expired
(4
)
 
66.75

 
(1
)
 
76.28

December 31, 2014
74

 
71.22

 
46

 
70.46

  Granted
54

 
102.59

 
9

 
101.58

  Exercised
(71
)
 
71.12

 
(38
)
 
69.81

  Forfeited or expired
(9
)
 
101.58

 
(2
)
 
98.46

December 31, 2015
48

 
101.40

 
15

 
$
86.35

 
 
 
 
 
 
 
 
Exercisable at December 31, 2015
2

 
$
74.29

 
8

 
$
72.76

 
 
Stock Options and SARs Outstanding
Exercise Price
 
Number Outstanding
 
Weighted
Average
Remaining Life
 
Weighted
Average
Exercise Price
 
 
(In Thousands)
 
(In Years)
 
 
$50.01 - $70.00
 
2

 
6.17
 
$
53.57

$70.01 - $90.00
 
8

 
5.20
 
$
77.99

$90.01 - $110.00
 
53

 
6.37
 
$
102.62

 
 
63