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Special Charges and Mark-to-Market ("MTM") Adjustments (Tables)
 6 Months Ended
Jun. 30, 2019
Other Income and Expenses [Abstract]  
Components of Special Charges
For the three and six months ended June 30, special charges and MTM adjustments consisted of the following (in millions):
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
Operating:
2019
 
2018
 
2019
 
2018
Impairment of assets
$
61

 
$
111

 
$
69

 
$
134

Severance and benefit costs
6

 
11

 
12

 
25

(Gains) losses on sale of assets and other special charges
4

 
7

 
8

 
10

Total operating special charges
71

 
129

 
89

 
169

Nonoperating MTM (gains) losses on financial instruments
(34
)
 
135

 
(51
)
 
90

Total special charges and MTM (gains) losses on financial instruments
37

 
264

 
38

 
259

Income tax benefit
(8
)
 
(59
)
 
(8
)
 
(58
)
Total special charges and MTM (gains) losses on financial instruments, net of income tax
$
29


$
205

 
$
30

 
$
201