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Special Charges and Mark-to-Market ("MTM") Adjustments (Tables)
 9 Months Ended
Sep. 30, 2019
Other Income and Expenses [Abstract]  
Components of Special Charges
For the three and nine months ended September 30, special charges and MTM adjustments consisted of the following (in millions):
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2019
 
2018
 
2019
 
2018
Severance and benefit costs
$
2

 
$
9

 
$
14

 
$
34

Impairment of assets
—

 
11

 
69

 
145

(Gains) losses on sale of assets and other special charges
25

 
(3
)
 
33

 
7

Total operating special charges
27

 
17

 
116

 
186

Nonoperating MTM (gains) losses on financial instruments
(21
)
 
(29
)
 
(72
)
 
61

Total special charges and MTM (gains) losses on financial instruments
6

 
(12
)
 
44

 
247

Income tax expense (benefit)
(2
)
 
3

 
(10
)
 
(55
)
Total special charges and MTM (gains) losses on financial instruments, net of income tax
$
4


$
(9
)
 
$
34

 
$
192