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Accumulated Other Comprehensive Loss
 6 Months Ended
Jun. 30, 2021
Equity [Abstract]  
Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss
Changes in AOCL, net of tax, by component
Dollars in millionsAccumulated foreign currency translation adjustmentsAccumulated pension liability adjustmentsChanges in fair value of derivativesTotal
Balance at December 31, 2020$(291)$(764)$(28)$(1,083)
   Other comprehensive income adjustments before reclassifications
8 — 8 16 
    Amounts reclassified from AOCL
3 13 6 22 
Net other comprehensive income (loss)11 13 14 38 
Balance at June 30, 2021$(280)$(751)$(14)$(1,045)

Dollars in millionsAccumulated foreign currency translation adjustmentsAccumulated pension liability adjustmentsChanges in fair value of derivativesTotal
Balance at December 31, 2019$(315)$(654)$(18)$(987)
   Other comprehensive income adjustments before reclassifications
(37)— (23)(60)
    Amounts reclassified from AOCL
(11)10 5 4 
Net other comprehensive income (loss)(48)10 (18)(56)
Balance at June 30, 2020$(363)$(644)$(36)$(1,043)

Reclassifications out of AOCL, net of tax, by component
Six Months Ended June 30,
Dollars in millions20212020Affected line item on the Condensed Consolidated Statements of Operations
Accumulated foreign currency adjustments
    Reclassification of foreign currency adjustments$(3)$11 Gain on disposition of assets and investments and Net income attributable to noncontrolling interests
Tax benefit
— — Provision for income taxes
Net accumulated foreign currency
$(3)$11 Net of tax
Accumulated pension liability adjustments
    Amortization of actuarial loss (a)$(16)$(12)See (a) below
Tax benefit
3 2 Provision for income taxes
Net pension and post-retirement benefits
$(13)$(10)Net of tax
Changes in fair value for derivatives
   Foreign currency hedge and interest rate swap settlements
$(8)$(6)Other non-operating income
Tax benefit
2 1 Provision for income taxes
Net changes in fair value of derivatives
$(6)$(5)Net of tax
(a)This item is included in the computation of net periodic pension cost. See Note 9 "Retirement Benefits" to our condensed consolidated financial statements for further discussion.