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Accumulated Other Comprehensive Income (Loss) | 9 Months Ended
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Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Accumulated Other Comprehensive Income (Loss) | 16. Accumulated Other Comprehensive Income (Loss) (PPL and LKE) 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 | )
(PPL) The following table presents the gains (losses) and related income taxes for reclassifications from AOCI for the periods ended September 30. 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 8 for additional information.
|  | 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] |
Accumulated Other Comprehensive Income (Loss) | 16. Accumulated Other Comprehensive Income (Loss) (PPL and LKE) 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 | )
(PPL) The following table presents the gains (losses) and related income taxes for reclassifications from AOCI for the periods ended September 30. 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 8 for additional information.
|  | 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 | ) |  |

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