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Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 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 June 30 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 |  |  |  |  |  |  |  |  |  |  |
March 31, 2018 | $ | (973 | ) |  | $ | (21 | ) |  | $ | — |  |  | $ | (7 | ) |  | $ | (2,278 | ) |  | $ | (3,279 | )
Amounts arising during the period | (250 | ) |  | 19 |  |  | — |  |  | (1 | ) |  | — |  |  | (232 | )
Reclassifications from AOCI | — |  |  | (19 | ) |  | — |  |  | 1 |  |  | 34 |  |  | 16 |
Net OCI during the period | (250 | ) |  | — |  |  | — |  |  | — |  |  | 34 |  |  | (216 | )
June 30, 2018 | $ | (1,223 | ) |  | $ | (21 | ) |  | $ | — |  |  | $ | (7 | ) |  | $ | (2,244 | ) |  | $ | (3,495 | )
| Foreign currency translation adjustments |  | Unrealized gains (losses) on qualifying derivatives |  |  |  | Defined benefit plans |  |
|  |  | Equity investees' AOCI |  | Prior service costs |  | Actuarial gain (loss) |  | Total
December 31, 2017 | $ | (1,089 | ) |  | $ | (13 | ) |  | $ | — |  |  | $ | (7 | ) |  | $ | (2,313 | ) |  | $ | (3,422 | )
Amounts arising during the period | (134 | ) |  | (1 | ) |  | — |  |  | (1 | ) |  | (1 | ) |  | (137 | )
Reclassifications from AOCI | — |  |  | (7 | ) |  | — |  |  | 1 |  |  | 70 |  |  | 64 |
Net OCI during the period | (134 | ) |  | (8 | ) |  | — |  |  | — |  |  | 69 |  |  | (73 | )
June 30, 2018 | $ | (1,223 | ) |  | $ | (21 | ) |  | $ | — |  |  | $ | (7 | ) |  | $ | (2,244 | ) |  | $ | (3,495 | )
March 31, 2017 | $ | (1,651 | ) |  | $ | (14 | ) |  | $ | (1 | ) |  | $ | (8 | ) |  | $ | (2,103 | ) |  | $ | (3,777 | )
Amounts arising during the period | 231 |  |  | (24 | ) |  | — |  |  | — |  |  | (11 | ) |  | 196 |
Reclassifications from AOCI | — |  |  | 25 |  |  | 1 |  |  | 1 |  |  | 31 |  |  | 58 |
Net OCI during the period | 231 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 20 |  |  | 254 |
June 30, 2017 | $ | (1,420 | ) |  | $ | (13 | ) |  | $ | — |  |  | $ | (7 | ) |  | $ | (2,083 | ) |  | $ | (3,523 | )
December 31, 2016 | $ | (1,627 | ) |  | $ | (7 | ) |  | $ | (1 | ) |  | $ | (8 | ) |  | $ | (2,135 | ) |  | $ | (3,778 | )
Amounts arising during the period | 207 |  |  | (30 | ) |  | — |  |  | — |  |  | (11 | ) |  | 166 |
Reclassifications from AOCI | — |  |  | 24 |  |  | 1 |  |  | 1 |  |  | 63 |  |  | 89 |
Net OCI during the period | 207 |  |  | (6 | ) |  | 1 |  |  | 1 |  |  | 52 |  |  | 255 |
June 30, 2017 | $ | (1,420 | ) |  | $ | (13 | ) |  | $ | — |  |  | $ | (7 | ) |  | $ | (2,083 | ) |  | $ | (3,523 | )
LKE |  |  |  |  |  |  |  |  |  |  |
March 31, 2018 |  |  |  |  | $ | — |  |  | $ | (9 | ) |  | $ | (78 | ) |  | $ | (87 | )
Amounts arising during the period |  |  |  |  | — |  |  | — |  |  | 1 |  |  | 1 |
Reclassifications from AOCI |  |  |  |  | — |  |  | 1 |  |  | (1 | ) |  | — |
Net OCI during the period |  |  |  |  | — |  |  | 1 |  |  | — |  |  | 1 |
June 30, 2018 |  |  |  |  | $ | — |  |  | $ | (8 | ) |  | $ | (78 | ) |  | $ | (86 | )
December 31, 2017 |  |  |  |  | $ | — |  |  | $ | (9 | ) |  | $ | (79 | ) |  | $ | (88 | )
Reclassifications from AOCI |  |  |  |  | — |  |  | 1 |  |  | 1 |  |  | 2 |
Net OCI during the period |  |  |  |  | — |  |  | 1 |  |  | 1 |  |  | 2 |
June 30, 2018 |  |  |  |  | $ | — |  |  | $ | (8 | ) |  | $ | (78 | ) |  | $ | (86 | )
March 31, 2017 |  |  |  |  | $ | — |  |  | $ | (8 | ) |  | $ | (60 | ) |  | $ | (68 | )
Amounts arising during the period |  |  |  |  | — |  |  | — |  |  | (11 | ) |  | (11 | )
Reclassifications from AOCI |  |  |  |  | — |  |  | 1 |  |  | 1 |  |  | 2 |
Net OCI during the period |  |  |  |  | — |  |  | 1 |  |  | (10 | ) |  | (9 | )
June 30, 2017 |  |  |  |  | $ | — |  |  | $ | (7 | ) |  | $ | (70 | ) |  | $ | (77 | )
December 31, 2016 |  |  |  |  | $ | (1 | ) |  | $ | (8 | ) |  | $ | (61 | ) |  | $ | (70 | )
Amounts arising during the period |  |  |  |  | — |  |  | — |  |  | (11 | ) |  | (11 | )
Reclassifications from AOCI |  |  |  |  | 1 |  |  | 1 |  |  | 2 |  |  | 4 |
Net OCI during the period |  |  |  |  | 1 |  |  | 1 |  |  | (9 | ) |  | (7 | )
June 30, 2017 |  |  |  |  | $ | — |  |  | $ | (7 | ) |  | $ | (70 | ) |  | $ | (77 | )
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 June 30.
|  | Three Months |  | Six Months |  | Affected Line Item on the
Details about AOCI |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | Statements of Income
Qualifying derivatives |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | (2 | ) |  | $ | (2 | ) |  | $ | (4 | ) |  | $ | (5 | ) |  | Interest Expense
Cross-currency swaps |  | 24 |  |  | (29 | ) |  | 12 |  |  | (26 | ) |  | Other Income (Expense) - net
|  | — |  |  | (1 | ) |  | — |  |  | — |  |  | Interest Expense
Total Pre-tax |  | 22 |  |  | (32 | ) |  | 8 |  |  | (31 | ) |  |
Income Taxes |  | (3 | ) |  | 7 |  |  | (1 | ) |  | 7 |  |  |
Total After-tax |  | 19 |  |  | (25 | ) |  | 7 |  |  | (24 | ) |  |
Equity investees' AOCI |  | — |  |  | (1 | ) |  | — |  |  | (1 | ) |  | Other Income (Expense) - net
Total Pre-tax |  | — |  |  | (1 | ) |  | — |  |  | (1 | ) |  |
Income Taxes |  | — |  |  | — |  |  | — |  |  | — |  |  |
Total After-tax |  | — |  |  | (1 | ) |  | — |  |  | (1 | ) |  |
Defined benefit plans |  |  |  |  |  |  |  |  |  |
Prior service costs (a) |  | (1 | ) |  | (1 | ) |  | (1 | ) |  | (1 | ) |  |
Net actuarial loss (a) |  | (43 | ) |  | (40 | ) |  | (88 | ) |  | (81 | ) |  |
Total Pre-tax |  | (44 | ) |  | (41 | ) |  | (89 | ) |  | (82 | ) |  |
Income Taxes |  | 9 |  |  | 9 |  |  | 18 |  |  | 18 |  |  |
Total After-tax |  | (35 | ) |  | (32 | ) |  | (71 | ) |  | (64 | ) |  |
Total reclassifications during the period |  | $ | (16 | ) |  | $ | (58 | ) |  | $ | (64 | ) |  | $ | (89 | ) |  |
(a) | These AOCI components are included in the computation of net periodic defined benefit cost. See Note 9 for additional information.
LG And E And KU Energy LLC [Member] |
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.
LKE |  |  |  |  |  |  |  |  |  |  |
March 31, 2018 |  |  |  |  | $ | — |  |  | $ | (9 | ) |  | $ | (78 | ) |  | $ | (87 | )
Amounts arising during the period |  |  |  |  | — |  |  | — |  |  | 1 |  |  | 1 |
Reclassifications from AOCI |  |  |  |  | — |  |  | 1 |  |  | (1 | ) |  | — |
Net OCI during the period |  |  |  |  | — |  |  | 1 |  |  | — |  |  | 1 |
June 30, 2018 |  |  |  |  | $ | — |  |  | $ | (8 | ) |  | $ | (78 | ) |  | $ | (86 | )
December 31, 2017 |  |  |  |  | $ | — |  |  | $ | (9 | ) |  | $ | (79 | ) |  | $ | (88 | )
Reclassifications from AOCI |  |  |  |  | — |  |  | 1 |  |  | 1 |  |  | 2 |
Net OCI during the period |  |  |  |  | — |  |  | 1 |  |  | 1 |  |  | 2 |
June 30, 2018 |  |  |  |  | $ | — |  |  | $ | (8 | ) |  | $ | (78 | ) |  | $ | (86 | )
March 31, 2017 |  |  |  |  | $ | — |  |  | $ | (8 | ) |  | $ | (60 | ) |  | $ | (68 | )
Amounts arising during the period |  |  |  |  | — |  |  | — |  |  | (11 | ) |  | (11 | )
Reclassifications from AOCI |  |  |  |  | — |  |  | 1 |  |  | 1 |  |  | 2 |
Net OCI during the period |  |  |  |  | — |  |  | 1 |  |  | (10 | ) |  | (9 | )
June 30, 2017 |  |  |  |  | $ | — |  |  | $ | (7 | ) |  | $ | (70 | ) |  | $ | (77 | )
December 31, 2016 |  |  |  |  | $ | (1 | ) |  | $ | (8 | ) |  | $ | (61 | ) |  | $ | (70 | )
Amounts arising during the period |  |  |  |  | — |  |  | — |  |  | (11 | ) |  | (11 | )
Reclassifications from AOCI |  |  |  |  | 1 |  |  | 1 |  |  | 2 |  |  | 4 |
Net OCI during the period |  |  |  |  | 1 |  |  | 1 |  |  | (9 | ) |  | (7 | )
June 30, 2017 |  |  |  |  | $ | — |  |  | $ | (7 | ) |  | $ | (70 | ) |  | $ | (77 | )

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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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