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Accumulated Other Comprehensive (Loss) Income (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Schedule of accumulated other comprehensive income (loss)

The table below summarizes changes in accumulated other comprehensive (loss) income recorded on our consolidated balance sheet by component for the years ended December 31, 2018 and December 31, 2019:
 
Pension Plans
 
Foreign Currency Translation Adjustments and Other
 
Total
 
(Dollars in millions)
Balance at December 31, 2017 (successor)
$
—

 
18

 
18

Other comprehensive loss before reclassifications
—

 
(200
)
 
(200
)
Amounts reclassified from accumulated other comprehensive income
5

 
—

 
5

Net current-period other comprehensive income (loss)
5

 
(200
)
 
(195
)
Cumulative effect of adoption of ASU 2018-02, Income Statement-Reporting Comprehensive Income: Reclassification of Certain Tax Effects from Accumulated other Comprehensive Income
—

 
6

 
6

Balance at December 31, 2018
$
5

 
(176
)
 
(171
)
 
 
 
 
 
 
Balance at December 31, 2018
$
5

 
(176
)
 
(171
)
Other comprehensive loss before reclassifications
—

 
(5
)
 
(5
)
Amounts reclassified from accumulated other comprehensive loss
(3
)
 
—

 
(3
)
Net current-period other comprehensive loss
(3
)
 
(5
)
 
(8
)
Balance at December 31, 2019
$
2

 
(181
)
 
(179
)