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Accumulated Other Comprehensive Income (Loss)
3 Months Ended
Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated Other Comprehensive Income (Loss)
17. Accumulated Other Comprehensive Income (Loss)
 
(PPL)
 
The after-tax changes in AOCI by component for the periods ended March 31 were as follows.
 Foreign
currency
translation
adjustments (a)
Unrealized gains (losses)
 on qualifying
derivatives
Defined benefit plans (b) 
Prior
service
costs
Actuarial
gain
(loss)
Total
PPL
December 31, 2020$(1,158)$— $(16)$(3,046)$(4,220)
Amounts arising during the period303 (30)— — 273 
Reclassifications from AOCI— 25 — 40 65 
Net OCI during the period303 (5)— 40 338 
March 31, 2021$(855)$(5)$(16)$(3,006)$(3,882)
December 31, 2019$(1,425)$(5)$(18)$(2,910)$(4,358)
Amounts arising during the period(61)— — (53)
Reclassifications from AOCI— (3)47 45 
Net OCI during the period(61)47 (8)
March 31, 2020$(1,486)$— $(17)$(2,863)$(4,366)

(a)    Amounts relate to operations of the U.K. utility business.
(b)    Substantially all of the amounts relate to pension plans of the U.K. utility business. At March 31, 2021, the combined accumulated other comprehensive loss related to these plans was $2.8 billion.
The following table presents PPL's gains (losses) and related income taxes for reclassifications from AOCI for the periods ended March 31.
 Three MonthsAffected Line Item on the
Details about AOCI20212020Statements of Income
Qualifying derivatives   
Interest rate swaps$(1)$(2)Interest Expense
(1)(1)Income (Loss) from Discontinued Operations (net of income taxes)
Cross-currency swaps(37)Income (Loss) from Discontinued Operations (net of income taxes)
Total Pre-tax(39)
Income Taxes14 —  
Total After-tax(25) 
Defined benefit plans  
Prior service costs (a)— (1)
Net actuarial loss (a)(62)(59)
Total Pre-tax(62)(60)
Income Taxes22 12 
Total After-tax(40)(48)
Total reclassifications during the period$(65)$(45)

(a)    These AOCI components are included in the computation of net periodic defined benefit cost. See Note 10 for additional information.