CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Current Assets
Cash and cash equivalents	$ 853		$ 901
Restricted cash and cash equivalents	119		54
Accounts receivable (less reserve:)
Customer	936		745
Other	60		79
Unbilled revenues	708		857
Fuel, materials and supplies	616		673
Prepayments	281		166
Price risk management assets	1,284		1,525
Regulatory assets	37		19
Other current assets	95		49
Total Current Assets	4,989		5,068
Investments
Nuclear plant decommissioning trust funds	764		712
Other investments	48		47
Total Investments	812		759
Property, Plant and Equipment
Regulated utility plant	25,054		25,196
Less: accumulated depreciation - regulated utility plant	4,258		4,164
Regulated utility plant, net	20,796		21,032
Non-regulated property, plant and equipment
Generation	11,545		11,295
Nuclear fuel	666		524
Other	737		726
Less: accumulated depreciation - non-regulated property, plant and equipment	6,039		5,942
Non-regulated property, plant and equipment, net	6,909		6,603
Construction work in progress	2,270		2,397
Property, Plant and Equipment, net	29,975	[1]	30,032	[1]
Other Noncurrent Assets
Regulatory assets	1,464		1,483
Goodwill	3,995		4,158
Other intangibles	910	[1]	925	[1]
Price risk management assets	598		572
Other noncurrent assets	598		637
Total Other Noncurrent Assets	7,565		7,775
Total Assets	43,341		43,634
Current Liabilities
Short-term debt	1,061		652
Long-term debt due within one year	751		751
Accounts payable	1,071		1,252
Taxes	138		90
Interest	352		325
Dividends	215		210
Price risk management liabilities	972		1,065
Regulatory liabilities	61		61
Other current liabilities	1,029		1,219
Total Current Liabilities	5,650		5,625
Long-term Debt	18,881		18,725
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes	3,577		3,387
Investment tax credits	340		328
Price risk management liabilities	533		629
Accrued pension obligations	1,596		2,076
Asset retirement obligations	540		536
Regulatory liabilities	1,016		1,010
Other deferred credits and noncurrent liabilities	666		820
Total Deferred Credits and Other Noncurrent Liabilities	8,268		8,786
Commitments and Contingent Liabilities
Equity
Common stock	6	[2]	6	[2]
Additional paid-in capital	6,988		6,936
Earnings reinvested	5,676		5,478
Accumulated other comprehensive income (loss)	(2,146)		(1,940)
Total Stockholders' Equity	10,524		10,480
Noncontrolling Interests	18		18
Total Equity	10,542		10,498
Total Liabilities and Equity	43,341		43,634
PPL Energy Supply LLC [Member]
Current Assets
Cash and cash equivalents	147		413
Restricted cash and cash equivalents	105		46
Accounts receivable (less reserve:)
Customer	209		183
Other	37		31
Unbilled revenues	246		369
Accounts receivable from affiliates	56		125
Fuel, materials and supplies	316		327
Prepayments	119		15
Price risk management assets	1,194		1,511
Other current assets	21		10
Total Current Assets	2,450		3,030
Investments
Nuclear plant decommissioning trust funds	764		712
Other investments	42		41
Total Investments	806		753
Non-regulated property, plant and equipment
Generation	11,555		11,305
Nuclear fuel	666		524
Other	295		294
Less: accumulated depreciation - non-regulated property, plant and equipment	5,908		5,817
Non-regulated property, plant and equipment, net	6,608		6,306
Construction work in progress	659		987
Property, Plant and Equipment, net	7,267	[1]	7,293	[1]
Other Noncurrent Assets
Goodwill	86		86
Other intangibles	255	[1]	252	[1]
Price risk management assets	482		557
Other noncurrent assets	361		404
Total Other Noncurrent Assets	1,184		1,299
Total Assets	11,707		12,375
Current Liabilities
Short-term debt	481		356
Long-term debt due within one year	741		751
Accounts payable	344		438
Accounts payable to affiliates	25		31
Taxes	31		62
Interest	57		31
Price risk management liabilities	951		1,010
Deferred income taxes	59		158
Other current liabilities	251		319
Total Current Liabilities	2,940		3,156
Long-term Debt	2,523		2,521
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes	1,311		1,232
Investment tax credits	200		186
Price risk management liabilities	481		556
Accrued pension obligations	193		293
Asset retirement obligations	370		365
Other deferred credits and noncurrent liabilities	195		218
Total Deferred Credits and Other Noncurrent Liabilities	2,750		2,850
Commitments and Contingent Liabilities
Equity
Accumulated other comprehensive income (loss)	45		48
Member's Equity	3,476		3,830
Noncontrolling Interests	18		18
Total Equity	3,494		3,848
Total Liabilities and Equity	11,707		12,375
PPL Electric Utilities Corp [Member]
Current Assets
Cash and cash equivalents	31		140
Accounts receivable (less reserve:)
Customer	325		249
Other	4		5
Unbilled revenues	105		110
Accounts receivable from affiliates	30		29
Fuel, materials and supplies	40		39
Prepayments	104		76
Deferred income taxes	49		45
Regulatory assets	5
Other current assets	17		4
Total Current Assets	705		697
Property, Plant and Equipment
Regulated utility plant	6,416		6,286
Less: accumulated depreciation - regulated utility plant	2,354		2,316
Regulated utility plant, net	4,062		3,970
Non-regulated property, plant and equipment
Other, net	2		2
Construction work in progress	427		370
Property, Plant and Equipment, net	4,491		4,342
Other Noncurrent Assets
Regulatory assets	860		853
Other intangibles	176		171
Other noncurrent assets	35		55
Total Other Noncurrent Assets	1,071		1,079
Total Assets	6,267		6,118
Current Liabilities
Short-term debt	125
Long-term debt due within one year	10
Accounts payable	241		259
Accounts payable to affiliates	60		63
Taxes	17		12
Interest	19		26
Regulatory liabilities	57		52
Other current liabilities	99		93
Total Current Liabilities	628		505
Long-term Debt	1,957		1,967
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes	1,274		1,233
Investment tax credits	3		3
Accrued pension obligations	152		237
Regulatory liabilities	13		8
Other deferred credits and noncurrent liabilities	79		103
Total Deferred Credits and Other Noncurrent Liabilities	1,521		1,584
Commitments and Contingent Liabilities
Equity
Common stock	364	[3]	364	[3]
Additional paid-in capital	1,195		1,135
Earnings reinvested	602		563
Total Stockholders' Equity	2,161		2,062
Total Liabilities and Equity	6,267		6,118
LG And E And KU Energy LLC [Member]
Current Assets
Cash and cash equivalents	52		43
Accounts receivable (less reserve:)
Customer	218		133
Other	10		20
Unbilled revenues	156		156
Accounts receivable from affiliates	1		1
Fuel, materials and supplies	229		276
Prepayments	23		28
Price risk management assets from affiliates	24		14
Deferred income taxes	13		13
Regulatory assets	32		19
Other current assets	5		4
Total Current Assets	763		707
Property, Plant and Equipment
Regulated utility plant	8,137		8,073
Less: accumulated depreciation - regulated utility plant	578		519
Regulated utility plant, net	7,559		7,554
Non-regulated property, plant and equipment
Other, net	3		3
Construction work in progress	917		750
Property, Plant and Equipment, net	8,479		8,307
Other Noncurrent Assets
Regulatory assets	604		630
Goodwill	996		996
Other intangibles	258		271
Other noncurrent assets	104		108
Total Other Noncurrent Assets	1,962		2,005
Total Assets	11,204		11,019
Current Liabilities
Short-term debt	185		125
Notes payable with affiliates	85		25
Accounts payable	291		283
Accounts payable to affiliates	2		1
Customer deposits	49		48
Taxes	24		26
Interest	51		21
Price risk management liabilities	5		5
Regulatory liabilities	4		9
Other current liabilities	79		100
Total Current Liabilities	775		643
Long-term Debt	4,075		4,075
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes	587		541
Investment tax credits	138		138
Price risk management liabilities	49		53
Accrued pension obligations	265		414
Asset retirement obligations	127		125
Regulatory liabilities	1,003		1,002
Other deferred credits and noncurrent liabilities	233		242
Total Deferred Credits and Other Noncurrent Liabilities	2,402		2,515
Commitments and Contingent Liabilities
Equity
Member's Equity	3,952		3,786
Total Liabilities and Equity	11,204		11,019
Louisville Gas And Electric Co [Member]
Current Assets
Cash and cash equivalents	34		22
Accounts receivable (less reserve:)
Customer	99		59
Other	6		16
Unbilled revenues	71		72
Accounts receivable from affiliates	12		14
Fuel, materials and supplies	105		142
Prepayments	9		7
Price risk management assets from affiliates	12		7
Regulatory assets	21		19
Other current assets			1
Total Current Assets	369		359
Property, Plant and Equipment
Regulated utility plant	3,226		3,187
Less: accumulated depreciation - regulated utility plant	251		220
Regulated utility plant, net	2,975		2,967
Non-regulated property, plant and equipment
Construction work in progress	319		259
Property, Plant and Equipment, net	3,294		3,226
Other Noncurrent Assets
Regulatory assets	388		400
Goodwill	389		389
Other intangibles	138		144
Other noncurrent assets	39		44
Total Other Noncurrent Assets	954		977
Total Assets	4,617		4,562
Current Liabilities
Short-term debt	70		55
Accounts payable	131		117
Accounts payable to affiliates	16		23
Customer deposits	24		23
Taxes	19		2
Interest	11		5
Price risk management liabilities	5		5
Regulatory liabilities	3		4
Other current liabilities	29		34
Total Current Liabilities	308		268
Long-term Debt	1,112		1,112
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes	555		544
Investment tax credits	40		40
Price risk management liabilities	49		53
Accrued pension obligations	59		102
Asset retirement obligations	57		56
Regulatory liabilities	471		471
Other deferred credits and noncurrent liabilities	106		106
Total Deferred Credits and Other Noncurrent Liabilities	1,337		1,372
Commitments and Contingent Liabilities
Equity
Common stock	424	[4]	424	[4]
Additional paid-in capital	1,303		1,278
Earnings reinvested	133		108
Total Stockholders' Equity	1,860		1,810
Total Liabilities and Equity	4,617		4,562
Kentucky Utilities Co [Member]
Current Assets
Cash and cash equivalents	16		21
Accounts receivable (less reserve:)
Customer	119		74
Other	3		13
Unbilled revenues	85		84
Accounts receivable from affiliates	1		7
Fuel, materials and supplies	124		134
Prepayments	7		10
Price risk management assets from affiliates	12		7
Deferred income taxes	3		3
Regulatory assets	11
Other current assets	5		3
Total Current Assets	386		356
Property, Plant and Equipment
Regulated utility plant	4,911		4,886
Less: accumulated depreciation - regulated utility plant	327		299
Regulated utility plant, net	4,584		4,587
Non-regulated property, plant and equipment
Other, net	1		1
Construction work in progress	596		490
Property, Plant and Equipment, net	5,181		5,078
Other Noncurrent Assets
Regulatory assets	216		230
Goodwill	607		607
Other intangibles	120		127
Other noncurrent assets	58		57
Total Other Noncurrent Assets	1,001		1,021
Total Assets	6,568		6,455
Current Liabilities
Short-term debt	115		70
Accounts payable	151		147
Accounts payable to affiliates	41		33
Customer deposits	25		25
Taxes	9		26
Interest	25		10
Regulatory liabilities	1		5
Other current liabilities	27		33
Total Current Liabilities	394		349
Long-term Debt	1,842		1,842
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes	621		587
Investment tax credits	98		98
Accrued pension obligations	45		104
Asset retirement obligations	70		69
Regulatory liabilities	532		531
Other deferred credits and noncurrent liabilities	82		92
Total Deferred Credits and Other Noncurrent Liabilities	1,448		1,481
Commitments and Contingent Liabilities
Equity
Common stock	308	[5]	308	[5]
Additional paid-in capital	2,398		2,348
Earnings reinvested	177		126
Accumulated other comprehensive income (loss)	1		1
Total Stockholders' Equity	2,884		2,783
Total Liabilities and Equity	$ 6,568		$ 6,455

[1] At March 31, 2013 and December 31, 2012, includes $426 million and $428 million of PP&E, consisting primarily of "Generation," including leasehold improvements, and both periods include $10 million of "Other intangibles" from the consolidation of a VIE that is the owner/lessor of the Lower Mt. Bethel plant.

[2] 780,000 shares authorized; 583,214 and 581,944 shares issued and outstanding at March 31, 2013 and December 31, 2012.

[3] 170,000 shares authorized; 66,368 shares issued and outstanding at March 31, 2013 and December 31, 2012.

[4] 75,000 shares authorized; 21,294 shares issued and outstanding at March 31, 2013 and December 31, 2012.

[5] 80,000 shares authorized; 37,818 shares issued and outstanding at March 31, 2013 and December 31, 2012.