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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Accumulated Other Comprehensive Income (Loss) | The after-tax changes in AOCI by component for the years ended December 31 were as follows:
|  |  | Unrealized gains (losses) |  |  |  | Defined benefit plans |  |
| Foreign currency translation adjustments |  | Available- for-sale securities |  | Qualifying derivatives |  | Equity investees' AOCI |  | Prior service costs |  | Actuarial gain (loss) |  | Total
PPL |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2014 | $ | (286 | ) |  | $ | 201 |  |  | $ | 20 |  |  | $ | 1 |  |  | $ | 3 |  |  | $ | (2,213 | ) |  | $ | (2,274 | )
Amounts arising during the year | (234 | ) |  | 8 |  |  | 26 |  |  | — |  |  | (9 | ) |  | (366 | ) |  | (575 | )
Reclassifications from AOCI | — |  |  | (2 | ) |  | 2 |  |  | (1 | ) |  | — |  |  | 146 |  |  | 145 |
Net OCI during the year | (234 | ) |  | 6 |  |  | 28 |  |  | (1 | ) |  | (9 | ) |  | (220 | ) |  | (430 | )
Distribution of PPL Energy Supply (See Note 8) | — |  |  | (207 | ) |  | (55 | ) |  | — |  |  | — |  |  | 238 |  |  | (24 | )
December 31, 2015 | $ | (520 | ) |  | $ | — |  |  | $ | (7 | ) |  | $ | — |  |  | $ | (6 | ) |  | $ | (2,195 | ) |  | $ | (2,728 | )
Amounts arising during the year | (1,107 | ) |  | — |  |  | 91 |  |  | — |  |  | (3 | ) |  | (61 | ) |  | (1,080 | )
Reclassifications from AOCI | — |  |  | — |  |  | (91 | ) |  | (1 | ) |  | 1 |  |  | 121 |  |  | 30 |
Net OCI during the year | (1,107 | ) |  | — |  |  | — |  |  | (1 | ) |  | (2 | ) |  | 60 |  |  | (1,050 | )
December 31, 2016 | $ | (1,627 | ) |  | $ | — |  |  | $ | (7 | ) |  | $ | (1 | ) |  | $ | (8 | ) |  | $ | (2,135 | ) |  | $ | (3,778 | )
Amounts arising during the year | 538 |  |  | — |  |  | (79 | ) |  | — |  |  | — |  |  | (308 | ) |  | 151 |
Reclassifications from AOCI | — |  |  | — |  |  | 73 |  |  | 1 |  |  | 1 |  |  | 130 |  |  | 205 |
Net OCI during the year | 538 |  |  | — |  |  | (6 | ) |  | 1 |  |  | 1 |  |  | (178 | ) |  | 356 |
December 31, 2017 | $ | (1,089 | ) |  | $ | — |  |  | $ | (13 | ) |  | $ | — |  |  | $ | (7 | ) |  | $ | (2,313 | ) |  | $ | (3,422 | )
LKE |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2014 |  |  |  |  |  |  |  |  |  | $ | — |  |  | $ | (8 | ) |  | $ | (37 | ) |  | $ | (45 | )
Amounts arising during the year |  |  |  |  |  |  |  |  |  | — |  |  | (3 | ) |  | (4 | ) |  | (7 | )
Reclassifications from AOCI |  |  |  |  |  |  | — |  |  | 1 |  |  | 5 |  |  | 6 |
Net OCI during the year |  |  |  |  |  |  |  |  |  | — |  |  | (2 | ) |  | 1 |  |  | (1 | )
December 31, 2015 |  |  |  |  |  |  |  |  |  | $ | — |  |  | $ | (10 | ) |  | $ | (36 | ) |  | $ | (46 | )
Amounts arising during the year |  |  |  |  |  |  |  |  |  | — |  |  | — |  |  | (27 | ) |  | (27 | )
Reclassifications from AOCI |  |  |  |  |  |  |  |  |  | (1 | ) |  | 2 |  |  | 2 |  |  | 3 |
Net OCI during the year |  |  |  |  |  |  |  |  |  | (1 | ) |  | 2 |  |  | (25 | ) |  | (24 | )
December 31, 2016 |  |  |  |  |  |  |  |  |  | $ | (1 | ) |  | $ | (8 | ) |  | $ | (61 | ) |  | $ | (70 | )
Amounts arising during the year |  |  |  |  |  |  |  |  | — |  |  | (2 | ) |  | (23 | ) |  | (25 | )
Reclassifications from AOCI |  |  |  |  |  |  |  |  |  | 1 |  |  | 1 |  |  | 5 |  |  | 7 |
Net OCI during the year |  |  |  |  |  |  |  |  |  | 1 |  |  | (1 | ) |  | (18 | ) |  | (18 | )
December 31, 2017 |  |  |  |  |  |  |  |  |  | $ | — |  |  | $ | (9 | ) |  | $ | (79 | ) |  | $ | (88 | )
Reclassification out of Other Comprehensive Income (Loss) | The following table presents PPL's gains (losses) and related income taxes for reclassifications from AOCI for the years ended December 31, 2017, 2016 and 2015.
|  | PPL |  |
Details about AOCI |  | 2017 |  | 2016 |  | 2015 |  | Affected Line Item on the Statements of Income
Available-for-sale securities |  | $ | — |  |  | $ | — |  |  | $ | 4 |  |  | Other Income (Expense) - net
Total Pre-tax |  | — |  |  | — |  |  | 4 |  |  |
Income Taxes |  | — |  |  | — |  |  | (2 | ) |  |
Total After-tax |  | — |  |  | — |  |  | 2 |  |  |
Qualifying derivatives |  |  |  |  |  |  |  |
Interest rate swaps |  | (9 | ) |  | (7 | ) |  | (11 | ) |  | Interest Expense
|  | — |  |  | — |  |  | (77 | ) |  | Discontinued operations
Cross-currency swaps |  | (82 | ) |  | 116 |  |  | 49 |  |  | Other Income (Expense) - net
|  | — |  |  | 3 |  |  | 2 |  |  | Interest Expense
Commodity contracts |  | — |  |  | — |  |  | 20 |  |  | Discontinued operations
Total Pre-tax |  | (91 | ) |  | 112 |  |  | (17 | ) |  |
Income Taxes |  | 18 |  |  | (21 | ) |  | 15 |  |  |
Total After-tax |  | (73 | ) |  | 91 |  |  | (2 | ) |  |
Equity Investees' AOCI |  | (1 | ) |  | 1 |  |  | 1 |  |  | Other Income (Expense) - net
Total Pre-tax |  | (1 | ) |  | 1 |  |  | 1 |  |  |
Income Taxes |  | — |  |  | — |  |  | — |  |  |
Total After-tax |  | (1 | ) |  | 1 |  |  | 1 |  |  |
Defined benefit plans |  |  |  |  |  |  |  |
Prior service costs |  | (2 | ) |  | (2 | ) |  | — |  |  |
Net actuarial loss |  | (167 | ) |  | (156 | ) |  | (192 | ) |  |
Total Pre-tax |  | (169 | ) |  | (158 | ) |  | (192 | ) |  |
Income Taxes |  | 38 |  |  | 36 |  |  | 46 |  |  |
Total After-tax |  | (131 | ) |  | (122 | ) |  | (146 | ) |  |
Total reclassifications during the year |  | $ | (205 | ) |  | $ | (30 | ) |  | $ | (145 | ) |  |
LG And E And KU Energy LLC [Member] |
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Accumulated Other Comprehensive Income (Loss) | The after-tax changes in AOCI by component for the years ended December 31 were as follows:
|  |  | Unrealized gains (losses) |  |  |  | Defined benefit plans |  |
| Foreign currency translation adjustments |  | Available- for-sale securities |  | Qualifying derivatives |  | Equity investees' AOCI |  | Prior service costs |  | Actuarial gain (loss) |  | Total
PPL |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2014 | $ | (286 | ) |  | $ | 201 |  |  | $ | 20 |  |  | $ | 1 |  |  | $ | 3 |  |  | $ | (2,213 | ) |  | $ | (2,274 | )
Amounts arising during the year | (234 | ) |  | 8 |  |  | 26 |  |  | — |  |  | (9 | ) |  | (366 | ) |  | (575 | )
Reclassifications from AOCI | — |  |  | (2 | ) |  | 2 |  |  | (1 | ) |  | — |  |  | 146 |  |  | 145 |
Net OCI during the year | (234 | ) |  | 6 |  |  | 28 |  |  | (1 | ) |  | (9 | ) |  | (220 | ) |  | (430 | )
Distribution of PPL Energy Supply (See Note 8) | — |  |  | (207 | ) |  | (55 | ) |  | — |  |  | — |  |  | 238 |  |  | (24 | )
December 31, 2015 | $ | (520 | ) |  | $ | — |  |  | $ | (7 | ) |  | $ | — |  |  | $ | (6 | ) |  | $ | (2,195 | ) |  | $ | (2,728 | )
Amounts arising during the year | (1,107 | ) |  | — |  |  | 91 |  |  | — |  |  | (3 | ) |  | (61 | ) |  | (1,080 | )
Reclassifications from AOCI | — |  |  | — |  |  | (91 | ) |  | (1 | ) |  | 1 |  |  | 121 |  |  | 30 |
Net OCI during the year | (1,107 | ) |  | — |  |  | — |  |  | (1 | ) |  | (2 | ) |  | 60 |  |  | (1,050 | )
December 31, 2016 | $ | (1,627 | ) |  | $ | — |  |  | $ | (7 | ) |  | $ | (1 | ) |  | $ | (8 | ) |  | $ | (2,135 | ) |  | $ | (3,778 | )
Amounts arising during the year | 538 |  |  | — |  |  | (79 | ) |  | — |  |  | — |  |  | (308 | ) |  | 151 |
Reclassifications from AOCI | — |  |  | — |  |  | 73 |  |  | 1 |  |  | 1 |  |  | 130 |  |  | 205 |
Net OCI during the year | 538 |  |  | — |  |  | (6 | ) |  | 1 |  |  | 1 |  |  | (178 | ) |  | 356 |
December 31, 2017 | $ | (1,089 | ) |  | $ | — |  |  | $ | (13 | ) |  | $ | — |  |  | $ | (7 | ) |  | $ | (2,313 | ) |  | $ | (3,422 | )
LKE |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2014 |  |  |  |  |  |  |  |  |  | $ | — |  |  | $ | (8 | ) |  | $ | (37 | ) |  | $ | (45 | )
Amounts arising during the year |  |  |  |  |  |  |  |  |  | — |  |  | (3 | ) |  | (4 | ) |  | (7 | )
Reclassifications from AOCI |  |  |  |  |  |  | — |  |  | 1 |  |  | 5 |  |  | 6 |
Net OCI during the year |  |  |  |  |  |  |  |  |  | — |  |  | (2 | ) |  | 1 |  |  | (1 | )
December 31, 2015 |  |  |  |  |  |  |  |  |  | $ | — |  |  | $ | (10 | ) |  | $ | (36 | ) |  | $ | (46 | )
Amounts arising during the year |  |  |  |  |  |  |  |  |  | — |  |  | — |  |  | (27 | ) |  | (27 | )
Reclassifications from AOCI |  |  |  |  |  |  |  |  |  | (1 | ) |  | 2 |  |  | 2 |  |  | 3 |
Net OCI during the year |  |  |  |  |  |  |  |  |  | (1 | ) |  | 2 |  |  | (25 | ) |  | (24 | )
December 31, 2016 |  |  |  |  |  |  |  |  |  | $ | (1 | ) |  | $ | (8 | ) |  | $ | (61 | ) |  | $ | (70 | )
Amounts arising during the year |  |  |  |  |  |  |  |  | — |  |  | (2 | ) |  | (23 | ) |  | (25 | )
Reclassifications from AOCI |  |  |  |  |  |  |  |  |  | 1 |  |  | 1 |  |  | 5 |  |  | 7 |
Net OCI during the year |  |  |  |  |  |  |  |  |  | 1 |  |  | (1 | ) |  | (18 | ) |  | (18 | )
December 31, 2017 |  |  |  |  |  |  |  |  |  | $ | — |  |  | $ | (9 | ) |  | $ | (79 | ) |  | $ | (88 | )

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