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Quarterly Results of Operations (Unaudited)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Results of Operations (Unaudited)
Quarterly Results of Operations (Unaudited)
The following table summarizes quarterly unaudited results of operations for the years ended December 31, 2018 and 2017.
 
For The Quarter Ended
 
March 31,
2018
 
June 30,
2018
 
Sept. 30, 2018
 
December 31,
2018
 
(In millions, except per-share data)
Total revenue
$
4,646

 
$
4,883

 
$
4,697

 
$
4,664

Margin
615

 
673

 
566

 
664

Gain (loss) on sales of subsidiaries
—

 
—

 
37

 
(52
)
Restructuring and separation costs
25

 
8

 
5

 
8

Net income
107

 
202

 
197

 
201

 
 
 
 
 
 
 
 
Net income per share (1):
 
 
 
 
 
 
 
Basic
$
1.79

 
$
3.29

 
$
3.22

 
$
3.24

Diluted
$
1.64

 
$
3.02

 
$
2.90

 
$
3.01

 
For The Quarter Ended
 
March 31,
2017
 
June 30,
2017
 
Sept. 30, 2017
 
December 31,
2017
 
(In millions, except per-share data)
Total revenue
$
4,904

 
$
4,999

 
$
5,031

 
$
4,949

Margin
546

 
254

 
564

 
446

Impairment losses
—

 
72

 
129

 
269

Restructuring and separation costs
—

 
43

 
118

 
73

Net income (loss)
77

 
(230
)
 
(97
)
 
(262
)
 
 
 
 
 
 
 
 
Net income (loss) per share (1):
 
 
 
 
 
 
 
Basic
$
1.38

 
$
(4.10
)
 
$
(1.70
)
 
$
(4.59
)
Diluted
$
1.37

 
$
(4.10
)
 
$
(1.70
)
 
$
(4.59
)
_______________________________
(1)
The dilutive effect of all potentially dilutive common shares is calculated using the treasury stock method and is based on the weighted-average common share equivalents outstanding during each quarter. Accordingly, the sum of the quarterly net income (loss) per share may not agree to the total for the year. Certain potentially dilutive common shares issuable are not included in the computation of diluted net income (loss) per share because to do so would be anti-dilutive.