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Accumulated Other Comprehensive Income (Loss) | 3 Months Ended
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Mar. 31, 2018
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 |  | Unrealized gains (losses) on qualifying derivatives |  |  |  | Defined benefit plans |  |
|  |  | Equity investees' AOCI |  | Prior service costs |  | Actuarial gain (loss) |  | Total
PPL |  |  |  |  |  |  |  |  |  |  |
December 31, 2017 | $ | (1,089 | ) |  | $ | (13 | ) |  | $ | — |  |  | $ | (7 | ) |  | $ | (2,313 | ) |  | $ | (3,422 | )
Amounts arising during the period | 116 |  |  | (20 | ) |  | — |  |  | — |  |  | (1 | ) |  | 95 |
Reclassifications from AOCI | — |  |  | 12 |  |  | — |  |  | — |  |  | 36 |  |  | 48 |
Net OCI during the period | 116 |  |  | (8 | ) |  | — |  |  | — |  |  | 35 |  |  | 143 |
March 31, 2018 | $ | (973 | ) |  | $ | (21 | ) |  | $ | — |  |  | $ | (7 | ) |  | $ | (2,278 | ) |  | $ | (3,279 | )
December 31, 2016 | $ | (1,627 | ) |  | $ | (7 | ) |  | $ | (1 | ) |  | $ | (8 | ) |  | $ | (2,135 | ) |  | $ | (3,778 | )
Amounts arising during the period | (24 | ) |  | (6 | ) |  | — |  |  | — |  |  | — |  |  | (30 | )
Reclassifications from AOCI | — |  |  | (1 | ) |  | — |  |  | — |  |  | 32 |  |  | 31 |
Net OCI during the period | (24 | ) |  | (7 | ) |  | — |  |  | — |  |  | 32 |  |  | 1 |
March 31, 2017 | $ | (1,651 | ) |  | $ | (14 | ) |  | $ | (1 | ) |  | $ | (8 | ) |  | $ | (2,103 | ) |  | $ | (3,777 | )
The following table presents the gains (losses) and related income taxes for reclassifications from AOCI for the periods ended March 31. The defined benefit plan components of AOCI are not reflected in their entirety in the Statement of Income during the periods; rather, they are included in the computation of net periodic defined benefit costs (credits) and subject to capitalization. See Note 9 for additional information.
|  | Three Months |  | Affected Line Item on the
Details about AOCI |  | 2018 |  | 2017 |  | Statements of Income
Qualifying derivatives |  |  |  |  |  |
Interest rate swaps |  | $ | (2 | ) |  | $ | (3 | ) |  | Interest Expense
Cross-currency swaps |  | (12 | ) |  | 3 |  |  | Other Income (Expense) - net
|  | — |  |  | 1 |  |  | Interest Expense
Total Pre-tax |  | (14 | ) |  | 1 |  |  |
Income Taxes |  | 2 |  |  | — |  |  |
Total After-tax |  | (12 | ) |  | 1 |  |  |
Defined benefit plans |  |  |  |  |  |
Net actuarial loss |  | (45 | ) |  | (41 | ) |  |
Total Pre-tax |  | (45 | ) |  | (41 | ) |  |
Income Taxes |  | 9 |  |  | 9 |  |  |
Total After-tax |  | (36 | ) |  | (32 | ) |  |
Total reclassifications during the period |  | $ | (48 | ) |  | $ | (31 | ) |  |

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