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Supplemental Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]  
Supplemental Quarterly Financial Data
 
 
First
 
Second
 
Third
 
Fourth
 
Total
 
 
(In millions, except per share amounts)
2015
 
 
 
 
 
 
 
 
 
 
Revenues and other
 
$
1,653

 
$
2,019

 
$
1,531

 
$
1,405

 
$
6,608

Gain (loss) on divestitures
 
(18
)
 
227

 
(5
)
 
77

 
281

Expenses(1)
 
2,703

 
3,163

 
5,645

 
6,537

 
18,048

Net income (loss) from continuing operations including noncontrolling interest
 
(1,068
)
 
(917
)
 
(4,119
)
 
(5,055
)
 
(11,159
)
Net income (loss) from discontinued operations, net of tax
 
(238
)
 
120

 
(17
)
 
627

 
492

Net income (loss) including noncontrolling interest
 
$
(1,306
)
 
$
(797
)
 
$
(4,136
)
 
$
(4,428
)
 
$
(10,667
)
Net income (loss) attributable to common stock
 
$
(1,334
)
 
$
(860
)
 
$
(4,143
)
 
$
(4,015
)
 
$
(10,352
)
Basic net income (loss) per common share(2):
 
 
 
 
 
 
 
 
 
 
Net income (loss) from continuing operations
 
$
(2.91
)
 
$
(2.60
)
 
$
(10.91
)
 
$
(12.28
)
 
$
(28.70
)
Net income (loss) from discontinued operations
 
(0.63
)
 
0.32

 
(0.04
)
 
1.66

 
1.30

Net income (loss) per share
 
$
(3.54
)
 
$
(2.28
)
 
$
(10.95
)
 
$
(10.62
)
 
$
(27.40
)
Diluted net income (loss) per common share(2):
 
 
 
 
 
 
 
 
 
 
Net income (loss) from continuing operations
 
$
(2.91
)
 
$
(2.60
)
 
$
(10.91
)
 
$
(12.28
)
 
$
(28.70
)
Net income (loss) from discontinued operations
 
(0.63
)
 
0.32

 
(0.04
)
 
1.66

 
1.30

Net income (loss) per share
 
$
(3.54
)
 
$
(2.28
)
 
$
(10.95
)
 
$
(10.62
)
 
$
(27.40
)
2014
 
 
 
 
 
 
 
 
 
 
Revenues and other
 
$
3,423

 
$
3,323

 
$
3,476

 
$
2,858

 
$
13,080

Gain (loss) on divestitures
 
3

 
(787
)
 
—

 
(824
)
 
(1,608
)
Expenses(1)
 
2,786

 
2,839

 
3,817

 
8,342

 
17,784

Net income (loss) from continuing operations including noncontrolling interest
 
640

 
(303
)
 
(341
)
 
(6,308
)
 
(6,312
)
Net income (loss) from discontinued operations, net of tax
 
(545
)
 
68

 
(247
)
 
(983
)
 
(1,707
)
Net income (loss) including noncontrolling interest
 
$
95

 
$
(235
)
 
$
(588
)
 
$
(7,291
)
 
$
(8,019
)
Net income (loss) attributable to common stock
 
$
(18
)
 
$
(354
)
 
$
(691
)
 
$
(7,297
)
 
$
(8,360
)
Basic net income (loss) per common share(2):
 
 
 
 
 
 
 
 
 
 
Net income (loss) from continuing operations
 
$
1.35

 
$
(1.10
)
 
$
(1.17
)
 
$
(16.77
)
 
$
(17.32
)
Net income (loss) from discontinued operations
 
(1.38
)
 
0.18

 
(0.65
)
 
(2.61
)
 
(4.44
)
Net income (loss) per share
 
$
(0.03
)
 
$
(0.92
)
 
$
(1.82
)
 
$
(19.38
)
 
$
(21.76
)
Diluted net income (loss) per common share(2):
 
 
 
 
 
 
 
 
 
 
Net income (loss) from continuing operations
 
$
1.35

 
$
(1.10
)
 
$
(1.17
)
 
$
(16.77
)
 
$
(17.32
)
Net income (loss) from discontinued operations
 
(1.38
)
 
0.18

 
(0.65
)
 
(2.61
)
 
(4.44
)
Net income (loss) per share
 
$
(0.03
)
 
$
(0.92
)
 
$
(1.82
)
 
$
(19.38
)
 
$
(21.76
)
 
(1)
Continuing operating expenses for 2015 include non-cash asset impairments totaling $2.1 billion, $660 million, $4.1 billion, and $5.1 billion in the first, second, third, and fourth quarters of 2015, respectively. Continuing operating expenses for 2014 include non-cash asset impairments totaling $115 million, $162 million, $123 million, and $8.7 billion in the first, second, third, and fourth quarters of 2014, respectively.
(2)
The sum of the individual quarterly net income per common share amounts may not agree with full-year net income per common share as each quarterly computation is based on the weighted-average number of common shares outstanding during that period.