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Special Charges and Mark-to-Market ("MTM") Adjustments (Tables)
 3 Months Ended
Mar. 31, 2019
Other Income and Expenses [Abstract]  
Components of Special Charges
For the three months ended March 31, special charges and MTM adjustments consisted of the following (in millions):
 
Three Months Ended
March 31,
Operating:
2019
 
2018
Impairment of assets
$
8

 
$
23

Severance and benefit costs
6

 
14

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

 
3

Total operating special charges
18

 
40

Nonoperating MTM gains on financial instruments
(17
)
 
(45
)
 Total special charges and MTM gains on financial instruments
1

 
(5
)
Income tax expense
—

 
1

Total special charges and MTM gains on financial instruments, net of income tax
$
1


$
(4
)