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Capital Stock (Tables)
 12 Months Ended
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Common Stock Outstanding
Common Stock Outstanding
 
 
 
2016
 
2015
 
2014
Balance, beginning of year
 
378,034,175

 
376,504,892

 
395,772,908

Shares issued for stock-based compensation plans:
 
 
 
 
 
 
Treasury shares issued
 
11,504

 
17,525

 
17,454

Common shares issued
 
1,393,997

 
1,511,758

 
1,665,259

Treasury shares acquired
 
—

 
—

 
(20,950,729
)
Balance, end of year
 
379,439,676

 
378,034,175

 
376,504,892
Net Income Per Common Share
A reconciliation of the components of basic and diluted net income (loss) per common share for the years ended December 31, 2016, 2015, and 2014 is presented in the table below.
 
 
 
2016
 
2015
 
2014
 
 
Loss
 
Shares
 
Per Share
 
Income (Loss)
 
Shares
 
Per Share
 
Loss
 
Shares
 
Per Share
 
 
(In millions, except per share amounts)
Basic and Diluted:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Loss from continuing operations
 
$
(1,372
)
 
379

 
$
(3.62
)
 
$
(10,844
)
 
378

 
$
(28.70
)
 
$
(6,653
)
 
384

 
$
(17.32
)
Income (loss) from discontinued operations
 
(33
)
 
379

 
(0.09
)
 
492

 
378

 
1.30

 
(1,707
)
 
384

 
(4.44
)
Loss attributable to common stock
 
$
(1,405
)
 
379

 
$
(3.71
)
 
$
(10,352
)
 
378

 
$
(27.40
)
 
$
(8,360
)
 
384

 
$
(21.76
)
Description of Stock Based Compensation Plans and Related Costs
A description of the Company’s stock-based compensation plans and related costs follows:
 
 
 
2016
 
2015
 
2014
 
 
(In millions)
Stock-based compensation expensed
 
$
131

 
$
100

 
$
148

Stock-based compensation capitalized
 
40

 
53

 
62

Total stock-based compensation costs
 
$
171

 
$
153

 
$
210
Summary of Stock Options Activities
A summary of stock options issued and outstanding under the Stock Option Plan and the Omnibus Plans is presented in the table and narrative below:
 
 
 
2016
 
 
Shares
Under Option
 
Weighted Average
Exercise Price
 
 
(In thousands)
 
 
Outstanding, beginning of year
 
4,931

 
$
91.52

Granted
 
873

 
41.24

Exercised
 
—

 
—

Forfeited or expired
 
(691
)
 
76.99

Outstanding, end of year(1)
 
5,113

 
84.89

Expected to vest(2)
 
887

 
46.88

Exercisable, end of year(3)
 
4,177

 
93.40

 
(1)
As of December 31, 2016, options outstanding had a weighted average remaining contractual life of 4.6 years and aggregate intrinsic value of $18 million.
(2)
As of December 31, 2016, options expected to vest had a weighted average remaining contractual life of 8.7 years and aggregate intrinsic value of $17 million.
(3)
As of December 31, 2016, options exercisable had a weighted average remaining contractual life of 3.7 years and aggregate intrinsic value of nil.
Schedule of Assumptions Used
 
 
2016
 
2015
 
2014
Expected volatility
 
32.72
%
 
N/A
 
N/A
Expected dividend yields
 
2.42
%
 
N/A
 
N/A
Expected term (in years)
 
6

 
N/A
 
N/A
Risk-free rate
 
1.44
%
 
N/A
 
N/A
Weighted-average grant-date fair value
 
$
10.38

 
N/A
 
N/A
Schedule of Restricted Stock and Restricted Stock Units Activity
A summary of restricted stock unit activity for the year ended December 31, 2016, is presented below.
 
 
 
Shares
 
Weighted-
Average Grant-
Date Fair Value
 
 
(In thousands)
 
 
Non-vested at January 1, 2016
 
4,570

 
$
70.86

Granted
 
4,049

 
47.37

Vested
 
(2,081
)
 
72.59

Forfeited
 
(476
)
 
58.05

Non-vested at December 31, 2016
 
6,062

 
55.55
Total Shareholder Return Stock Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Restricted Stock and Restricted Stock Units Activity
The weighted-average remaining life of the unvested conditional restricted stock units is approximately 0.7 years.
 
 
 
Shares
 
Weighted-
Average Grant-
Date Fair
Value(1)
 
 
(In thousands)
 
 
Non-vested at January 1, 2016
 
172

 
$
78.22

Granted
 
—

 
—

Vested
 
(34
)
 
76.07

Forfeited or expired
 
(60
)
 
71.20

Non-vested at December 31, 2016
 
78

 
77.10

 
(1)
The fair value of each conditional restricted stock unit award is estimated as of the date of grant using a Monte Carlo simulation with the following assumptions used for all grants made under the plan: (i) a three-year continuous risk-free interest rate; (ii) a constant volatility assumption based on the historical realized stock price volatility of the Company and the designated peer group; and (iii) the historical stock prices and expected dividends of the common stock of the Company and its designated peer group.
Conditional Restricted Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Restricted Stock and Restricted Stock Units Activity
 
 
Shares
 
Weighted
Average Grant-
Date Fair
Value(1)
 
 
(In thousands)
 
 
Non-vested at January 1, 2016
 
501

 
$
66.53

Granted
 
871

 
34.19

Vested
 
—

 
—

Forfeited or expired
 
(147
)
 
45.65

Non-vested at December 31, 2016
 
1,225

 
45.60

 
(1)
The fair value of each conditional restricted stock unit award is estimated as of the date of grant using a Monte Carlo simulation with the following assumptions used for all grants made under the plan: (i) a three-year continuous risk-free interest rate; (ii) a constant volatility assumption based on the historical realized stock price volatility of the Company and the designated peer group; and (iii) the historical stock prices and expected dividends of the common stock of the Company and its designated peer group.