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Segment Information (Tables)
12 Months Ended
Dec. 31, 2021
Segment Reporting [Abstract]  
Schedule of Total Revenues and Intersegment Revenues by Segment
Total revenues and intersegment revenues by segment for the years ended December 31, 2021, 2020 and 2019 consists of the following:
(Dollars in millions)202120202019
AST$970 $940 $781 
NC&C972 1,026 1,053 
IMS959 834 917 
Corporate & Eliminations(22)(22)(37)
Total revenue
$2,879 $2,778 $2,714 
(Dollars in millions)202120202019
AST$14 $12 $12 
NC&C24 
IMS
Total intersegment revenue
$22 $22 $37 
Schedule of Depreciation, Assets by Segment and EBITDA Reconciliation to Net Earnings
Depreciation by segment as of December 31, 2021, 2020 and 2019 consists of the following:
(Dollars in millions)202120202019
AST$20 $19 $19 
NC&C13 1110 
IMS16 1413 
Total depreciation
$49 $44 $42 
Total assets by segment as of December 31, 2021 and 2020 consist of the following:
(Dollars in millions)2021
2020(1)
AST$929 $864 
NC&C616 699 
IMS1,145 1,018 
Corporate & Eliminations379 375 
Total assets
$3,069 $2,956 
(1) The 2020 amounts have been adjusted to reflect the correction of the allocation of certain assets within each segment.
Reconciliation of reportable segment Adjusted EBITDA to Net Earnings (loss) consists of the following:
(Dollars in millions)202120202019
Adjusted EBITDA
AST$125 $123 $94 
NC&C95 90 75 
IMS90 55 63 
Corporate & Eliminations— — 
Total Adjusted EBITDA
$310 $268 $234 
Amortization of intangibles(9)(9)(9)
Depreciation(49)(44)(42)
Restructuring costs(5)(12)(20)
Interest expense(35)(64)(65)
Deal related transaction costs (5)(9)— 
Acquisition and divestiture related expenses— — — 
Foreign exchange(1)(1)— 
COVID-19 response costs(6)(12)— 
Non-service pension expense— (5)(3)
Other one-time non-operational events— — — 
Income tax provision(46)(27)(20)
Net earnings
$154 $85 $75