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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2018
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 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 | )
Reclassification out of Other Comprehensive Income (Loss) | The following table presents the gains (losses) and related income taxes for reclassifications from AOCI for the periods ended March 31.
|  | 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 |  |  |
Equity investees' AOCI |  | — |  |  | — |  |  | Other Income (Expense) - net
Total Pre-tax |  | — |  |  | — |  |  |
Income Taxes |  | — |  |  | — |  |  |
Total After-tax |  | — |  |  | — |  |  |
Defined benefit plans |  |  |  |  |  |
Prior service costs |  | — |  |  | — |  |  |
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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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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