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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2017
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 September 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 |  |  |  |  |  |  |  |  |  |  |
June 30, 2017 | $ | (1,420 | ) |  | $ | (13 | ) |  | $ | — |  |  | $ | (7 | ) |  | $ | (2,083 | ) |  | $ | (3,523 | )
Amounts arising during the period | (12 | ) |  | 1 |  |  | — |  |  | — |  |  | (3 | ) |  | (14 | )
Reclassifications from AOCI | — |  |  | — |  |  | — |  |  | — |  |  | 34 |  |  | 34 |
Net OCI during the period | (12 | ) |  | 1 |  |  | — |  |  | — |  |  | 31 |  |  | 20 |
September 30, 2017 | $ | (1,432 | ) |  | $ | (12 | ) |  | $ | — |  |  | $ | (7 | ) |  | $ | (2,052 | ) |  | $ | (3,503 | )
December 31, 2016 | $ | (1,627 | ) |  | $ | (7 | ) |  | $ | (1 | ) |  | $ | (8 | ) |  | $ | (2,135 | ) |  | $ | (3,778 | )
Amounts arising during the period | 195 |  |  | (29 | ) |  | — |  |  | — |  |  | (14 | ) |  | 152 |
Reclassifications from AOCI | — |  |  | 24 |  |  | 1 |  |  | 1 |  |  | 97 |  |  | 123 |
Net OCI during the period | 195 |  |  | (5 | ) |  | 1 |  |  | 1 |  |  | 83 |  |  | 275 |
September 30, 2017 | $ | (1,432 | ) |  | $ | (12 | ) |  | $ | — |  |  | $ | (7 | ) |  | $ | (2,052 | ) |  | $ | (3,503 | )
June 30, 2016 | $ | (716 | ) |  | $ | (5 | ) |  | $ | (1 | ) |  | $ | (5 | ) |  | $ | (2,130 | ) |  | $ | (2,857 | )
Amounts arising during the period | (641 | ) |  | 62 |  |  | — |  |  | — |  |  | (6 | ) |  | (585 | )
Reclassifications from AOCI | — |  |  | (69 | ) |  | — |  |  | — |  |  | 31 |  |  | (38 | )
Net OCI during the period | (641 | ) |  | (7 | ) |  | — |  |  | — |  |  | 25 |  |  | (623 | )
September 30, 2016 | $ | (1,357 | ) |  | $ | (12 | ) |  | $ | (1 | ) |  | $ | (5 | ) |  | $ | (2,105 | ) |  | $ | (3,480 | )
December 31, 2015 | $ | (520 | ) |  | $ | (7 | ) |  | $ | — |  |  | $ | (6 | ) |  | $ | (2,195 | ) |  | $ | (2,728 | )
Amounts arising during the period | (837 | ) |  | 57 |  |  | — |  |  | — |  |  | (4 | ) |  | (784 | )
Reclassifications from AOCI | — |  |  | (62 | ) |  | (1 | ) |  | 1 |  |  | 94 |  |  | 32 |
Net OCI during the period | (837 | ) |  | (5 | ) |  | (1 | ) |  | 1 |  |  | 90 |  |  | (752 | )
September 30, 2016 | $ | (1,357 | ) |  | $ | (12 | ) |  | $ | (1 | ) |  | $ | (5 | ) |  | $ | (2,105 | ) |  | $ | (3,480 | )
LKE |  |  |  |  |  |  |  |  |  |  |
June 30, 2017 |  |  |  |  | $ | — |  |  | $ | (7 | ) |  | $ | (70 | ) |  | $ | (77 | )
Amounts arising during the period |  |  |  |  | — |  |  | — |  |  | (1 | ) |  | (1 | )
Reclassifications from AOCI |  |  |  |  | — |  |  | — |  |  | 1 |  |  | 1 |
Net OCI during the period |  |  |  |  | — |  |  | — |  |  | — |  |  | — |
September 30, 2017 |  |  |  |  | $ | — |  |  | $ | (7 | ) |  | $ | (70 | ) |  | $ | (77 | )
December 31, 2016 |  |  |  |  | $ | (1 | ) |  | $ | (8 | ) |  | $ | (61 | ) |  | $ | (70 | )
Amounts arising during the period |  |  |  |  | — |  |  | — |  |  | (12 | ) |  | (12 | )
Reclassifications from AOCI |  |  |  |  | 1 |  |  | 1 |  |  | 3 |  |  | 5 |
Net OCI during the period |  |  |  |  | 1 |  |  | 1 |  |  | (9 | ) |  | (7 | )
September 30, 2017 |  |  |  |  | $ | — |  |  | $ | (7 | ) |  | $ | (70 | ) |  | $ | (77 | )
June 30, 2016 |  |  |  |  | $ | (1 | ) |  | $ | (9 | ) |  | $ | (33 | ) |  | $ | (43 | )
Reclassifications from AOCI |  |  |  |  | — |  |  | — |  |  | 1 |  |  | 1 |
Net OCI during the period |  |  |  |  | — |  |  | — |  |  | 1 |  |  | 1 |
September 30, 2016 |  |  |  |  | $ | (1 | ) |  | $ | (9 | ) |  | $ | (32 | ) |  | $ | (42 | )
| 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, 2015 |  |  |  |  | $ | — |  |  | $ | (10 | ) |  | $ | (36 | ) |  | $ | (46 | )
Amounts arising during the period |  |  |  |  | — |  |  | — |  |  | 1 |  |  | 1 |
Reclassifications from AOCI |  |  |  |  | (1 | ) |  | 1 |  |  | 3 |  |  | 3 |
Net OCI during the period |  |  |  |  | (1 | ) |  | 1 |  |  | 4 |  |  | 4 |
September 30, 2016 |  |  |  |  | $ | (1 | ) |  | $ | (9 | ) |  | $ | (32 | ) |  | $ | (42 | )
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 September 30.
|  | Three Months |  | Nine Months |  | Affected Line Item on the
Details about AOCI |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | Statements of Income
Qualifying derivatives |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | (2 | ) |  | $ | (2 | ) |  | $ | (7 | ) |  | $ | (5 | ) |  | Interest Expense
Cross-currency swaps |  | 2 |  |  | 86 |  |  | (24 | ) |  | 80 |  |  | Other Income (Expense) - net
|  | 1 |  |  | 2 |  |  | 1 |  |  | 2 |  |  | Interest Expense
Total Pre-tax |  | 1 |  |  | 86 |  |  | (30 | ) |  | 77 |  |  |
Income Taxes |  | (1 | ) |  | (17 | ) |  | 6 |  |  | (15 | ) |  |
Total After-tax |  | — |  |  | 69 |  |  | (24 | ) |  | 62 |  |  |
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 |  | (1 | ) |  | (1 | ) |  | (2 | ) |  | (2 | ) |  |
Net actuarial loss |  | (44 | ) |  | (41 | ) |  | (125 | ) |  | (121 | ) |  |
Total Pre-tax |  | (45 | ) |  | (42 | ) |  | (127 | ) |  | (123 | ) |  |
Income Taxes |  | 11 |  |  | 11 |  |  | 29 |  |  | 28 |  |  |
Total After-tax |  | (34 | ) |  | (31 | ) |  | (98 | ) |  | (95 | ) |  |
Total reclassifications during the period |  | $ | (34 | ) |  | $ | 38 |  |  | $ | (123 | ) |  | $ | (32 | ) |  |
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 September 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 |  |  |  |  |  |  |  |  |  |  |
June 30, 2017 | $ | (1,420 | ) |  | $ | (13 | ) |  | $ | — |  |  | $ | (7 | ) |  | $ | (2,083 | ) |  | $ | (3,523 | )
Amounts arising during the period | (12 | ) |  | 1 |  |  | — |  |  | — |  |  | (3 | ) |  | (14 | )
Reclassifications from AOCI | — |  |  | — |  |  | — |  |  | — |  |  | 34 |  |  | 34 |
Net OCI during the period | (12 | ) |  | 1 |  |  | — |  |  | — |  |  | 31 |  |  | 20 |
September 30, 2017 | $ | (1,432 | ) |  | $ | (12 | ) |  | $ | — |  |  | $ | (7 | ) |  | $ | (2,052 | ) |  | $ | (3,503 | )
December 31, 2016 | $ | (1,627 | ) |  | $ | (7 | ) |  | $ | (1 | ) |  | $ | (8 | ) |  | $ | (2,135 | ) |  | $ | (3,778 | )
Amounts arising during the period | 195 |  |  | (29 | ) |  | — |  |  | — |  |  | (14 | ) |  | 152 |
Reclassifications from AOCI | — |  |  | 24 |  |  | 1 |  |  | 1 |  |  | 97 |  |  | 123 |
Net OCI during the period | 195 |  |  | (5 | ) |  | 1 |  |  | 1 |  |  | 83 |  |  | 275 |
September 30, 2017 | $ | (1,432 | ) |  | $ | (12 | ) |  | $ | — |  |  | $ | (7 | ) |  | $ | (2,052 | ) |  | $ | (3,503 | )
June 30, 2016 | $ | (716 | ) |  | $ | (5 | ) |  | $ | (1 | ) |  | $ | (5 | ) |  | $ | (2,130 | ) |  | $ | (2,857 | )
Amounts arising during the period | (641 | ) |  | 62 |  |  | — |  |  | — |  |  | (6 | ) |  | (585 | )
Reclassifications from AOCI | — |  |  | (69 | ) |  | — |  |  | — |  |  | 31 |  |  | (38 | )
Net OCI during the period | (641 | ) |  | (7 | ) |  | — |  |  | — |  |  | 25 |  |  | (623 | )
September 30, 2016 | $ | (1,357 | ) |  | $ | (12 | ) |  | $ | (1 | ) |  | $ | (5 | ) |  | $ | (2,105 | ) |  | $ | (3,480 | )
December 31, 2015 | $ | (520 | ) |  | $ | (7 | ) |  | $ | — |  |  | $ | (6 | ) |  | $ | (2,195 | ) |  | $ | (2,728 | )
Amounts arising during the period | (837 | ) |  | 57 |  |  | — |  |  | — |  |  | (4 | ) |  | (784 | )
Reclassifications from AOCI | — |  |  | (62 | ) |  | (1 | ) |  | 1 |  |  | 94 |  |  | 32 |
Net OCI during the period | (837 | ) |  | (5 | ) |  | (1 | ) |  | 1 |  |  | 90 |  |  | (752 | )
September 30, 2016 | $ | (1,357 | ) |  | $ | (12 | ) |  | $ | (1 | ) |  | $ | (5 | ) |  | $ | (2,105 | ) |  | $ | (3,480 | )
LKE |  |  |  |  |  |  |  |  |  |  |
June 30, 2017 |  |  |  |  | $ | — |  |  | $ | (7 | ) |  | $ | (70 | ) |  | $ | (77 | )
Amounts arising during the period |  |  |  |  | — |  |  | — |  |  | (1 | ) |  | (1 | )
Reclassifications from AOCI |  |  |  |  | — |  |  | — |  |  | 1 |  |  | 1 |
Net OCI during the period |  |  |  |  | — |  |  | — |  |  | — |  |  | — |
September 30, 2017 |  |  |  |  | $ | — |  |  | $ | (7 | ) |  | $ | (70 | ) |  | $ | (77 | )
December 31, 2016 |  |  |  |  | $ | (1 | ) |  | $ | (8 | ) |  | $ | (61 | ) |  | $ | (70 | )
Amounts arising during the period |  |  |  |  | — |  |  | — |  |  | (12 | ) |  | (12 | )
Reclassifications from AOCI |  |  |  |  | 1 |  |  | 1 |  |  | 3 |  |  | 5 |
Net OCI during the period |  |  |  |  | 1 |  |  | 1 |  |  | (9 | ) |  | (7 | )
September 30, 2017 |  |  |  |  | $ | — |  |  | $ | (7 | ) |  | $ | (70 | ) |  | $ | (77 | )
June 30, 2016 |  |  |  |  | $ | (1 | ) |  | $ | (9 | ) |  | $ | (33 | ) |  | $ | (43 | )
Reclassifications from AOCI |  |  |  |  | — |  |  | — |  |  | 1 |  |  | 1 |
Net OCI during the period |  |  |  |  | — |  |  | — |  |  | 1 |  |  | 1 |
September 30, 2016 |  |  |  |  | $ | (1 | ) |  | $ | (9 | ) |  | $ | (32 | ) |  | $ | (42 | )
| 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, 2015 |  |  |  |  | $ | — |  |  | $ | (10 | ) |  | $ | (36 | ) |  | $ | (46 | )
Amounts arising during the period |  |  |  |  | — |  |  | — |  |  | 1 |  |  | 1 |
Reclassifications from AOCI |  |  |  |  | (1 | ) |  | 1 |  |  | 3 |  |  | 3 |
Net OCI during the period |  |  |  |  | (1 | ) |  | 1 |  |  | 4 |  |  | 4 |
September 30, 2016 |  |  |  |  | $ | (1 | ) |  | $ | (9 | ) |  | $ | (32 | ) |  | $ | (42 | )

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