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Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Schedule of Accumulated Other Comprehensive Income (Loss) | The after-tax changes in AOCI by component for the periods ended June 30 were as follows.
| Foreign currency translation adjustments |  |  |  | Unrealized gains (losses) on qualifying derivatives |  |  |  | Defined benefit plans |  |
|  |  |  |  |  |  | Prior service costs |  | Actuarial gain (loss) |  | Total
PPL |  |  |  |  |  |  |  |  |  |  |  |  |
March 31, 2021 | $ | (855) |  |  |  |  | $ | (5) |  |  |  |  | $ | (16) |  |  | $ | (3,006) |  |  | $ | (3,882) |
Amounts arising during the period | 69 |  |  |  |  | (9) |  |  |  |  | — |  |  | (6) |  |  | 54 |
Reclassifications from AOCI | — |  |  |  |  | (1) |  |  |  |  | (7) |  |  | 67 |  |  | 59 |
Reclassifications from AOCI due to the sale of the U.K. utility business (Note 9) | 786 |  |  |  |  | 15 |  |  |  |  | 8 |  |  | 2,769 |  |  | 3,578 |
Net OCI during the period | 855 |  |  |  |  | 5 |  |  |  |  | 1 |  |  | 2,830 |  |  | 3,691 |
June 30, 2021 | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | (15) |  |  | $ | (176) |  |  | $ | (191) |
December 31, 2020 | $ | (1,158) |  |  |  |  | $ | — |  |  |  |  | $ | (16) |  |  | $ | (3,046) |  |  | $ | (4,220) |
Amounts arising during the period | 372 |  |  |  |  | (39) |  |  |  |  | — |  |  | (6) |  |  | 327 |
Reclassifications from AOCI | — |  |  |  |  | 24 |  |  |  |  | (7) |  |  | 107 |  |  | 124 |
Reclassifications from AOCI due to the sale of the U.K. utility business (Note 9) | 786 |  |  |  |  | 15 |  |  |  |  | 8 |  |  | 2,769 |  |  | 3,578 |
Net OCI during the period | 1,158 |  |  |  |  | — |  |  |  |  | 1 |  |  | 2,870 |  |  | 4,029 |
June 30, 2021 | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | (15) |  |  | $ | (176) |  |  | $ | (191) |
March 31, 2020 | $ | (1,486) |  |  |  |  | $ | — |  |  |  |  | $ | (17) |  |  | $ | (2,863) |  |  | $ | (4,366) |
Amounts arising during the period | (291) |  |  |  |  | 28 |  |  |  |  | — |  |  | (1) |  |  | (264) |
Reclassifications from AOCI | — |  |  |  |  | (20) |  |  |  |  | 1 |  |  | 47 |  |  | 28 |
Net OCI during the period | (291) |  |  |  |  | 8 |  |  |  |  | 1 |  |  | 46 |  |  | (236) |
June 30, 2020 | $ | (1,777) |  |  |  |  | $ | 8 |  |  |  |  | $ | (16) |  |  | $ | (2,817) |  |  | $ | (4,602) |
| Foreign currency translation adjustments |  |  |  | Unrealized gains (losses) on qualifying derivatives |  |  |  | Defined benefit plans |  |
|  |  |  |  |  |  | Prior service costs |  | Actuarial gain (loss) |  | Total
December 31, 2019 | $ | (1,425) |  |  |  |  | $ | (5) |  |  |  |  | $ | (18) |  |  | $ | (2,910) |  |  | $ | (4,358) |
Amounts arising during the period | (352) |  |  |  |  | 36 |  |  |  |  | — |  |  | (1) |  |  | (317) |
Reclassifications from AOCI | — |  |  |  |  | (23) |  |  |  |  | 2 |  |  | 94 |  |  | 73 |
Net OCI during the period | (352) |  |  |  |  | 13 |  |  |  |  | 2 |  |  | 93 |  |  | (244) |
June 30, 2020 | $ | (1,777) |  |  |  |  | $ | 8 |  |  |  |  | $ | (16) |  |  | $ | (2,817) |  |  | $ | (4,602) |
Reclassification out of Other Comprehensive Income (Loss) | The following table presents PPL's gains (losses) and related income taxes for reclassifications from AOCI for the periods ended June 30.
|  | Three Months |  | Six Months |  | Affected Line Item on the
Details about AOCI |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  | Statements of Income
Qualifying derivatives |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | 14 |  |  | $ | (2) |  |  | $ | 13 |  |  | $ | (4) |  |  | Interest Expense
|  | (1) |  |  | — |  |  | (2) |  |  | (1) |  |  | Income (Loss) from Discontinued Operations (net of income taxes)
Cross-currency swaps |  | (2) |  |  | 26 |  |  | (39) |  |  | 32 |  |  | Income (Loss) from Discontinued Operations (net of income taxes)
Total Pre-tax |  | 11 |  |  | 24 |  |  | (28) |  |  | 27 |  |  |
Income Taxes |  | (10) |  |  | (4) |  |  | 4 |  |  | (4) |  |  |
Total After-tax |  | 1 |  |  | 20 |  |  | (24) |  |  | 23 |  |  |
Defined benefit plans |  |  |  |  |  |  |  |  |  |
Prior service costs (a) |  | 9 |  |  | (1) |  |  | 9 |  |  | (2) |  |  |
Net actuarial loss (a) |  | (71) |  |  | (58) |  |  | (133) |  |  | (117) |  |  |
Total Pre-tax |  | (62) |  |  | (59) |  |  | (124) |  |  | (119) |  |  |
Income Taxes |  | 2 |  |  | 11 |  |  | 24 |  |  | 23 |  |  |
Total After-tax |  | (60) |  |  | (48) |  |  | (100) |  |  | (96) |  |  |
Sale of the U.K. utility business (Note 9) |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustments |  | (646) |  |  | — |  |  | (646) |  |  | — |  |  | Income (Loss) from Discontinued Operations (net of income taxes)
Qualifying derivatives |  | (15) |  |  | — |  |  | (15) |  |  | — |  |  | Income (Loss) from Discontinued Operations (net of income taxes)
Defined benefit plans |  | (3,577) |  |  | — |  |  | (3,577) |  |  | — |  |  | Income (Loss) from Discontinued Operations (net of income taxes)
Total Pre-tax |  | (4,238) |  |  | — |  |  | (4,238) |  |  | — |  |  |
Income Taxes |  | 660 |  |  | — |  |  | 660 |  |  | — |  |  |
Total After-tax |  | (3,578) |  |  | — |  |  | (3,578) |  |  | — |  |  |
Total reclassifications during the period |  | $ | (3,637) |  |  | $ | (28) |  |  | $ | (3,702) |  |  | $ | (73) |  |  |
(a) These AOCI components are included in the computation of net periodic defined benefit cost. See Note 10 for additional information.

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