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Accumulated Other Comprehensive Income (Loss) (After-tax Changes by Component) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | $ (3,422) | $ (3,778) | $ (2,728)
Amounts arising during the year | (606) | 151 | (1,080)
Reclassifications from AOCI | 115 | 205 | 30
Net OCI during the year | (491) | 356 | (1,050)
Adoption of reclassification of certain tax effects from AOCI guidance cumulative effect adjustment | (51) |  |
Balance at end of year | (3,964) | (3,422) | (3,778)
Foreign Currency Translation Adjustments [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | (1,089) | (1,627) | (520)
Amounts arising during the year | (444) | 538 | (1,107)
Reclassifications from AOCI | 0 | 0 | 0
Net OCI during the year | (444) | 538 | (1,107)
Adoption of reclassification of certain tax effects from AOCI guidance cumulative effect adjustment | 0 |  |
Balance at end of year | (1,533) | (1,089) | (1,627)
Qualifying Derivatives [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | (13) | (7) | (7)
Amounts arising during the year | 36 | (79) | 91
Reclassifications from AOCI | (29) | 73 | (91)
Net OCI during the year | 7 | (6) | 0
Adoption of reclassification of certain tax effects from AOCI guidance cumulative effect adjustment | (1) |  |
Balance at end of year | (7) | (13) | (7)
Equity Investees AOCI [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | 0 | (1) | 0
Amounts arising during the year | 0 | 0 | 0
Reclassifications from AOCI | 0 | 1 | (1)
Net OCI during the year | 0 | 1 | (1)
Adoption of reclassification of certain tax effects from AOCI guidance cumulative effect adjustment | 0 |  |
Balance at end of year | 0 | 0 | (1)
Prior Service Costs [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | (7) | (8) | (6)
Amounts arising during the year | (11) | 0 | (3)
Reclassifications from AOCI | 2 | 1 | 1
Net OCI during the year | (9) | 1 | (2)
Adoption of reclassification of certain tax effects from AOCI guidance cumulative effect adjustment | (3) |  |
Balance at end of year | (19) | (7) | (8)
Defined Benefit Plans Actuarial Gain (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | (2,313) | (2,135) | (2,195)
Amounts arising during the year | (187) | (308) | (61)
Reclassifications from AOCI | 142 | 130 | 121
Net OCI during the year | (45) | (178) | 60
Adoption of reclassification of certain tax effects from AOCI guidance cumulative effect adjustment | (47) |  |
Balance at end of year | (2,405) | (2,313) | (2,135)
LG And E And KU Energy LLC [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | (88) | (70) | (46)
Amounts arising during the year | 7 | (25) | (27)
Reclassifications from AOCI | 10 | 7 | 3
Net OCI during the year | 17 | (18) | (24)
Adoption of reclassification of certain tax effects from AOCI guidance cumulative effect adjustment | (18) |  |
Balance at end of year | (89) | (88) | (70)
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 | (1) | 0
Amounts arising during the year | 0 | 0 | 0
Reclassifications from AOCI | 0 | 1 | (1)
Net OCI during the year | 0 | 1 | (1)
Adoption of reclassification of certain tax effects from AOCI guidance cumulative effect adjustment | 0 |  |
Balance at end of year | 0 | 0 | (1)
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) | (8) | (10)
Amounts arising during the year | 0 | (2) | 0
Reclassifications from AOCI | 2 | 1 | 2
Net OCI during the year | 2 | (1) | 2
Adoption of reclassification of certain tax effects from AOCI guidance cumulative effect adjustment | (2) |  |
Balance at end of year | (9) | (9) | (8)
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 | (79) | (61) | (36)
Amounts arising during the year | 7 | (23) | (27)
Reclassifications from AOCI | 8 | 5 | 2
Net OCI during the year | 15 | (18) | (25)
Adoption of reclassification of certain tax effects from AOCI guidance cumulative effect adjustment | (16) |  |
Balance at end of year | $ (80) | $ (79) | $ (61)

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