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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets, Current [Abstract] |  |  |
Cash and cash equivalents |  | $ 629 | $ 485
Accounts receivable (less reserve:) |  |  |
Customer |  | 760 | 681
Other |  | 89 | 100
Unbilled revenues |  | 489 | 543
Prepayments |  | 139 | 66
Fuel, materials and supplies |  | 279 | 320
Price risk management assets |  | 56 | 49
Regulatory assets |  | 28 | 34
Other current assets |  | 49 | 50
Total Current Assets |  | 2,490 | 2,294
Property, Plant and Equipment |  |  |
Regulated utility plant |  | 38,891 | 38,228
Less: accumulated depreciation - regulated utility plant |  | 7,003 | 6,785
Regulated utility plant, net |  | 31,888 | 31,443
Non-regulated property, plant and equipment |  | 387 | 384
Less: accumulated depreciation - non-regulated property, plant and equipment |  | 114 | 110
Non-regulated property, plant and equipment, net |  | 273 | 274
Construction work in progress |  | 1,575 | 1,375
Property, Plant and Equipment, net |  | 33,736 | 33,092
Other Noncurrent Assets |  |  |
Regulatory assets |  | 1,519 | 1,504
Goodwill |  | 3,302 | 3,258
Other intangibles |  | 703 | 697
Pension benefit asset |  | 378 | 284
Price risk management assets |  | 120 | 215
Other noncurrent assets |  | 140 | 135
Total Other Noncurrent Assets |  | 6,162 | 6,093
Total Assets |  | 42,388 | 41,479
Current Liabilities |  |  |
Short-term debt |  | 1,457 | 1,080
Long-term debt due within one year |  | 250 | 348
Accounts payable |  | 836 | 924
Taxes |  | 128 | 105
Interest |  | 323 | 282
Dividends |  | 285 | 273
Customer deposits |  | 286 | 292
Regulatory liabilities |  | 158 | 95
Other current liabilities |  | 515 | 624
Total Current Liabilities |  | 4,238 | 4,023
Long-term Debt |  |  |
Long-term Debt |  | 20,214 | 19,847
Deferred Credits and Other Noncurrent Liabilities |  |  |
Deferred income taxes |  | 2,557 | 2,462
Investment tax credits |  | 128 | 129
Accrued pension obligations |  | 653 | 800
Asset retirement obligations |  | 292 | 312
Regulatory liabilities |  | 2,689 | 2,704
Other deferred credits and noncurrent liabilities |  | 441 | 441
Total Deferred Credits and Other Noncurrent Liabilities |  | 6,760 | 6,848
Commitments and Contingent Liabilities |  |  |
Equity |  |  |
Common stock | [1] | 7 | 7
Additional paid-in capital |  | 10,411 | 10,305
Earnings reinvested |  | 4,037 | 3,871
Accumulated other comprehensive loss |  | (3,279) | (3,422)
Total Equity |  | 11,176 | 10,761
Total Liabilities and Equity |  | 42,388 | 41,479
PPL Electric Utilities Corp [Member] |  |  |
Assets, Current [Abstract] |  |  |
Cash and cash equivalents |  | 20 | 49
Accounts receivable (less reserve:) |  |  |
Customer |  | 328 | 279
Other |  | 10 | 71
Accounts receivable from affiliates |  | 42 | 0
Unbilled revenues |  | 111 | 127
Prepayments |  | 75 | 6
Fuel, materials and supplies |  | 34 | 34
Regulatory assets |  | 16 | 16
Other current assets |  | 12 | 6
Total Current Assets |  | 648 | 588
Property, Plant and Equipment |  |  |
Regulated utility plant |  | 10,950 | 10,785
Less: accumulated depreciation - regulated utility plant |  | 2,815 | 2,778
Regulated utility plant, net |  | 8,135 | 8,007
Construction work in progress |  | 560 | 508
Property, Plant and Equipment, net |  | 8,695 | 8,515
Other Noncurrent Assets |  |  |
Regulatory assets |  | 726 | 709
Other intangibles |  | 259 | 259
Other noncurrent assets |  | 15 | 11
Total Other Noncurrent Assets |  | 1,000 | 979
Total Assets |  | 10,343 | 10,082
Current Liabilities |  |  |
Short-term debt |  | 213 | 0
Accounts payable |  | 362 | 386
Accounts payable to affiliates |  | 32 | 31
Taxes |  | 12 | 8
Interest |  | 38 | 36
Regulatory liabilities |  | 95 | 86
Other current liabilities |  | 83 | 98
Total Current Liabilities |  | 835 | 645
Long-term Debt |  |  |
Long-term Debt |  | 3,298 | 3,298
Deferred Credits and Other Noncurrent Liabilities |  |  |
Deferred income taxes |  | 1,184 | 1,154
Accrued pension obligations |  | 215 | 246
Regulatory liabilities |  | 662 | 668
Other deferred credits and noncurrent liabilities |  | 81 | 79
Total Deferred Credits and Other Noncurrent Liabilities |  | 2,142 | 2,147
Commitments and Contingent Liabilities |  |  |
Equity |  |  |
Common stock | [2] | 364 | 364
Additional paid-in capital |  | 2,729 | 2,729
Earnings reinvested |  | 975 | 899
Total Equity |  | 4,068 | 3,992
Total Liabilities and Equity |  | 10,343 | 10,082
LG And E And KU Energy LLC [Member] |  |  |
Assets, Current [Abstract] |  |  |
Cash and cash equivalents |  | 27 | 30
Accounts receivable (less reserve:) |  |  |
Customer |  | 247 | 246
Other |  | 41 | 44
Accounts receivable from affiliates |  | 1 | 0
Unbilled revenues |  | 172 | 203
Prepayments |  | 28 | 25
Fuel, materials and supplies |  | 212 | 254
Regulatory assets |  | 12 | 18
Other current assets |  | 5 | 8
Total Current Assets |  | 745 | 828
Property, Plant and Equipment |  |  |
Regulated utility plant |  | 13,226 | 13,187
Less: accumulated depreciation - regulated utility plant |  | 1,866 | 1,785
Regulated utility plant, net |  | 11,360 | 11,402
Construction work in progress |  | 775 | 627
Property, Plant and Equipment, net |  | 12,135 | 12,029
Other Noncurrent Assets |  |  |
Regulatory assets |  | 793 | 795
Goodwill |  | 996 | 996
Other intangibles |  | 84 | 86
Other noncurrent assets |  | 81 | 68
Total Other Noncurrent Assets |  | 1,954 | 1,945
Total Assets |  | 14,834 | 14,802
Current Liabilities |  |  |
Short-term debt |  | 215 | 244
Long-term debt due within one year |  | 0 | 98
Notes payable with affiliates |  | 237 | 225
Accounts payable |  | 292 | 338
Accounts payable to affiliates |  | 9 | 7
Taxes |  | 73 | 66
Price risk management liabilities |  | 4 | 4
Interest |  | 74 | 32
Customer deposits |  | 59 | 58
Regulatory liabilities |  | 63 | 9
Asset retirement obligations |  | 91 | 85
Other current liabilities |  | 94 | 161
Total Current Liabilities |  | 1,211 | 1,327
Long-term Debt |  |  |
Long-term debt |  | 4,859 | 4,661
Long-term debt to affiliate |  | 400 | 400
Long-term Debt |  | 5,259 | 5,061
Deferred Credits and Other Noncurrent Liabilities |  |  |
Deferred income taxes |  | 882 | 866
Investment tax credits |  | 128 | 129
Accrued pension obligations |  | 265 | 365
Asset retirement obligations |  | 249 | 271
Regulatory liabilities |  | 2,027 | 2,036
Price risk management liabilities |  | 18 | 22
Other deferred credits and noncurrent liabilities |  | 158 | 162
Total Deferred Credits and Other Noncurrent Liabilities |  | 3,727 | 3,851
Commitments and Contingent Liabilities |  |  |
Equity |  |  |
Member's Equity |  | 4,637 | 4,563
Total Liabilities and Equity |  | 14,834 | 14,802
Louisville Gas And Electric Co [Member] |  |  |
Assets, Current [Abstract] |  |  |
Cash and cash equivalents |  | 14 | 15
Accounts receivable (less reserve:) |  |  |
Customer |  | 111 | 116
Other |  | 14 | 13
Accounts receivable from affiliates |  | 31 | 24
Unbilled revenues |  | 75 | 91
Prepayments |  | 12 | 11
Fuel, materials and supplies |  | 95 | 131
Regulatory assets |  | 10 | 12
Other current assets |  | 1 | 3
Total Current Assets |  | 363 | 416
Property, Plant and Equipment |  |  |
Regulated utility plant |  | 5,597 | 5,587
Less: accumulated depreciation - regulated utility plant |  | 646 | 614
Regulated utility plant, net |  | 4,951 | 4,973
Construction work in progress |  | 401 | 305
Property, Plant and Equipment, net |  | 5,352 | 5,278
Other Noncurrent Assets |  |  |
Regulatory assets |  | 406 | 411
Goodwill |  | 389 | 389
Other intangibles |  | 51 | 53
Other noncurrent assets |  | 26 | 12
Total Other Noncurrent Assets |  | 872 | 865
Total Assets |  | 6,587 | 6,559
Current Liabilities |  |  |
Short-term debt |  | 137 | 199
Long-term debt due within one year |  | 0 | 98
Accounts payable |  | 170 | 179
Accounts payable to affiliates |  | 21 | 23
Taxes |  | 24 | 25
Price risk management liabilities |  | 4 | 4
Interest |  | 24 | 11
Customer deposits |  | 28 | 27
Regulatory liabilities |  | 29 | 3
Asset retirement obligations |  | 19 | 24
Other current liabilities |  | 34 | 52
Total Current Liabilities |  | 490 | 645
Long-term Debt |  |  |
Long-term Debt |  | 1,808 | 1,611
Deferred Credits and Other Noncurrent Liabilities |  |  |
Deferred income taxes |  | 582 | 572
Investment tax credits |  | 35 | 35
Accrued pension obligations |  | 0 | 45
Asset retirement obligations |  | 92 | 97
Regulatory liabilities |  | 912 | 919
Price risk management liabilities |  | 18 | 22
Other deferred credits and noncurrent liabilities |  | 85 | 86
Total Deferred Credits and Other Noncurrent Liabilities |  | 1,724 | 1,776
Commitments and Contingent Liabilities |  |  |
Equity |  |  |
Common stock | [3] | 424 | 424
Additional paid-in capital |  | 1,712 | 1,712
Earnings reinvested |  | 429 | 391
Total Equity |  | 2,565 | 2,527
Total Liabilities and Equity |  | 6,587 | 6,559
Kentucky Utilities Co [Member] |  |  |
Assets, Current [Abstract] |  |  |
Cash and cash equivalents |  | 11 | 15
Accounts receivable (less reserve:) |  |  |
Customer |  | 136 | 130
Other |  | 26 | 30
Unbilled revenues |  | 97 | 112
Prepayments |  | 14 | 14
Fuel, materials and supplies |  | 117 | 123
Regulatory assets |  | 2 | 6
Other current assets |  | 4 | 5
Total Current Assets |  | 407 | 435
Property, Plant and Equipment |  |  |
Regulated utility plant |  | 7,620 | 7,592
Less: accumulated depreciation - regulated utility plant |  | 1,218 | 1,170
Regulated utility plant, net |  | 6,402 | 6,422
Construction work in progress |  | 373 | 321
Property, Plant and Equipment, net |  | 6,775 | 6,743
Other Noncurrent Assets |  |  |
Regulatory assets |  | 387 | 384
Goodwill |  | 607 | 607
Other intangibles |  | 33 | 33
Other noncurrent assets |  | 67 | 52
Total Other Noncurrent Assets |  | 1,094 | 1,076
Total Assets |  | 8,276 | 8,254
Current Liabilities |  |  |
Short-term debt |  | 78 | 45
Accounts payable |  | 109 | 137
Accounts payable to affiliates |  | 54 | 53
Taxes |  | 33 | 19
Interest |  | 38 | 16
Customer deposits |  | 31 | 31
Regulatory liabilities |  | 34 | 6
Asset retirement obligations |  | 72 | 61
Other current liabilities |  | 30 | 46
Total Current Liabilities |  | 479 | 414
Long-term Debt |  |  |
Long-term Debt |  | 2,329 | 2,328
Deferred Credits and Other Noncurrent Liabilities |  |  |
Deferred income taxes |  | 696 | 691
Investment tax credits |  | 93 | 94
Accrued pension obligations |  | 0 | 36
Asset retirement obligations |  | 157 | 174
Regulatory liabilities |  | 1,115 | 1,117
Other deferred credits and noncurrent liabilities |  | 42 | 43
Total Deferred Credits and Other Noncurrent Liabilities |  | 2,103 | 2,155
Commitments and Contingent Liabilities |  |  |
Equity |  |  |
Common stock | [4] | 308 | 308
Additional paid-in capital |  | 2,616 | 2,616
Earnings reinvested |  | 441 | 433
Total Equity |  | 3,365 | 3,357
Total Liabilities and Equity |  | $ 8,276 | $ 8,254
[1] | 1,560,000 shares authorized; 697,383 and 693,398 shares issued and outstanding at March 31, 2018 and December 31, 2017.
[2] | 170,000 shares authorized; 66,368 shares issued and outstanding at March 31, 2018 and December 31, 2017.
[3] | 75,000 shares authorized; 21,294 shares issued and outstanding at March 31, 2018 and December 31, 2017.
[4] | 80,000 shares authorized; 37,818 shares issued and outstanding at March 31, 2018 and December 31, 2017.

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