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Accumulated Other Comprehensive Income (Loss) (After-tax Changes by Component) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | $ (3,964) | $ (3,422) | $ (3,778)
Amounts arising during the year | (496) | (606) | 151
Reclassifications from AOCI | 102 | 115 | 205
Net OCI during the year | (394) | (491) | 356
Adoption of reclassification of certain tax effects from AOCI guidance cumulative effect adjustment |  | (51) |
Balance at end of year | (4,358) | (3,964) | (3,422)
Foreign Currency Translation Adjustments [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | (1,533) | (1,089) | (1,627)
Amounts arising during the year | 108 | (444) | 538
Reclassifications from AOCI | 0 | 0 | 0
Net OCI during the year | 108 | (444) | 538
Adoption of reclassification of certain tax effects from AOCI guidance cumulative effect adjustment |  | 0 |
Balance at end of year | (1,425) | (1,533) | (1,089)
Qualifying Derivatives [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | (7) | (13) | (7)
Amounts arising during the year | (11) | 36 | (79)
Reclassifications from AOCI | 13 | (29) | 73
Net OCI during the year | 2 | 7 | (6)
Adoption of reclassification of certain tax effects from AOCI guidance cumulative effect adjustment |  | (1) |
Balance at end of year | (5) | (7) | (13)
Equity Investees AOCI [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | 0 | 0 | (1)
Amounts arising during the year | 0 | 0 | 0
Reclassifications from AOCI | 0 | 0 | 1
Net OCI during the year | 0 | 0 | 1
Adoption of reclassification of certain tax effects from AOCI guidance cumulative effect adjustment |  | 0 |
Balance at end of year | 0 | 0 | 0
Prior Service Costs [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | (19) | (7) | (8)
Amounts arising during the year | (1) | (11) | 0
Reclassifications from AOCI | 2 | 2 | 1
Net OCI during the year | 1 | (9) | 1
Adoption of reclassification of certain tax effects from AOCI guidance cumulative effect adjustment |  | (3) |
Balance at end of year | (18) | (19) | (7)
Defined Benefit Plans Actuarial Gain (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | (2,405) | (2,313) | (2,135)
Amounts arising during the year | (592) | (187) | (308)
Reclassifications from AOCI | 87 | 142 | 130
Net OCI during the year | (505) | (45) | (178)
Adoption of reclassification of certain tax effects from AOCI guidance cumulative effect adjustment |  | (47) |
Balance at end of year | (2,910) | (2,405) | (2,313)
LG And E And KU Energy LLC [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | (89) | (88) | (70)
Amounts arising during the year | (7) | 7 | (25)
Reclassifications from AOCI | 3 | 10 | 7
Net OCI during the year | (4) | 17 | (18)
Adoption of reclassification of certain tax effects from AOCI guidance cumulative effect adjustment |  | (18) |
Balance at end of year | (93) | (89) | (88)
LG And E And KU Energy LLC [Member] | Equity Investees AOCI [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | 0 | 0 | (1)
Amounts arising during the year | 0 | 0 | 0
Reclassifications from AOCI | 0 | 0 | 1
Net OCI during the year | 0 | 0 | 1
Adoption of reclassification of certain tax effects from AOCI guidance cumulative effect adjustment |  | 0 |
Balance at end of year | 0 | 0 | 0
LG And E And KU Energy LLC [Member] | Prior Service Costs [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | (9) | (9) | (8)
Amounts arising during the year | (1) | 0 | (2)
Reclassifications from AOCI | 1 | 2 | 1
Net OCI during the year | 0 | 2 | (1)
Adoption of reclassification of certain tax effects from AOCI guidance cumulative effect adjustment |  | (2) |
Balance at end of year | (9) | (9) | (9)
LG And E And KU Energy LLC [Member] | Defined Benefit Plans Actuarial Gain (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | (80) | (79) | (61)
Amounts arising during the year | (6) | 7 | (23)
Reclassifications from AOCI | 2 | 8 | 5
Net OCI during the year | (4) | 15 | (18)
Adoption of reclassification of certain tax effects from AOCI guidance cumulative effect adjustment |  | (16) |
Balance at end of year | $ (84) | $ (80) | $ (79)

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