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Restructuring Charges (Tables)
6 Months Ended
Jun. 30, 2021
Restructuring and Related Activities [Abstract]  
Schedule of restructuring charges and asset impairments
Dollars in millionsSeveranceLease AbandonmentOtherTotal Restructuring ChargesAsset ImpairmentsTotal Restructuring Charges & Asset Impairments
    Government Solutions$$— $— $$— $
    Sustainable Technology Solutions29 39 49 88 
    Other54 20 75 49 124 
      Total$32 $58 $26 $116 $98 $214 
Schedule of reconciliation of beginning and ending restructuring liability A reconciliation of the beginning and ending restructuring liability balances is provided in the following table.
Dollars in millionsSeveranceLease AbandonmentOtherTotal
Balance at January 1, 2021$15 $52 $24 $91 
    Lease restructuring charges related to operating lease liabilities— — 
Cash payments / settlements during the period
(7)(3)(3)(13)
Currency translation and other adjustments
(2)— — (2)
Balance at June 30, 2021$$51 $21 $78