Segment and Related Information (Income Statement and Balance Sheet Data) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013 Integer		Dec. 31, 2012		Dec. 31, 2011
Segment Information (Numeric) [Abstract]
Number of reportable segments																	4
Income Statement Data
Revenues																	$ 11,860		$ 12,286		$ 12,737
Depreciation																	1,161		1,100		960
Amortization																	222		186		254
Unrealized (gains) losses on derivatives, and other hedging activities																	236		27		(314)
Interest Expenses																	1,006		961		898
Income from Continuing Operations Before Income Taxes																	1,309		2,082		2,201
Income Taxes																	180		545		691
Deferred income taxes and investment tax credits																	72	[1]	426	[1]	584	[1]
Net Income Attributable to PPL Shareowners	(98)	[2],[3]	410	[2]	405	[2]	413	[2]	359	[2]	355	[2]	271	[2]	541	[2]	1,130		1,526		1,495
Cash Flow [Abstract]
Expenditures for long-lived assets																	4,283		3,153		2,556
Balance Sheet Data
Assets	46,259								43,634								46,259		43,634
Segment (Numeric) [Abstract]
Loss on lease termination for Colstrip coal-fired electric generating facility, pre-tax																	697
Loss on lease termination for Colstrip coal-fired electric generating facility, after-tax																	413
Kentucky Regulated [Member]
Income Statement Data
Depreciation																	334		346		334
Amortization																	22	[4]	27	[4]	27	[4]
Unrealized (gains) losses on derivatives, and other hedging activities																	12	[5]	11	[5]	9	[5]
Interest Expenses																	212		219		217
Income from Continuing Operations Before Income Taxes																	484		263		349
Income Taxes																	179	[6]	80	[6]	127	[6]
Deferred income taxes and investment tax credits																	254	[1]	136	[1]	218	[1]
Net Income Attributable to PPL Shareowners																	307		177		221
Cash Flow [Abstract]
Expenditures for long-lived assets																	1,434		768		465
Balance Sheet Data
Assets	12,016								10,670								12,016		10,670
Kentucky Regulated [Member] | Utility Service [Member]
Income Statement Data
Revenues																	2,976	[7]	2,759	[7]	2,793	[7]
United Kingdom Regulated [Member]
Income Statement Data
Revenues																	2,403		2,336		1,653
Depreciation																	300		279		218
Amortization																	19	[4]	15	[4]	83	[4]
Unrealized (gains) losses on derivatives, and other hedging activities																	(44)		(52)		8
Interest Expenses																	425		421		391
Income from Continuing Operations Before Income Taxes																	993		953		358
Income Taxes																	71	[6]	150	[6]	33	[6]
Deferred income taxes and investment tax credits																	(45)	[1]	26	[1]	(39)	[1]
Net Income Attributable to PPL Shareowners																	922		803		325
Cash Flow [Abstract]
Expenditures for long-lived assets																	1,280		1,016		862
Balance Sheet Data
Assets	15,895								14,073								15,895		14,073
United Kingdom Regulated [Member] | Utility Service [Member]
Income Statement Data
Revenues																	2,359	[7]	2,289	[7]	1,618	[7]
United Kingdom Regulated [Member] | Energy Related Businesses [Member]
Income Statement Data
Revenues																	44		47		35
Pennsylvania Regulated [Member]
Income Statement Data
Depreciation																	178		160		146
Amortization																	19	[4]	18	[4]	7	[4]
Interest Expenses																	108		99		98
Income from Continuing Operations Before Income Taxes																	317		204		257
Income Taxes																	108	[6]	68	[6]	68	[6]
Deferred income taxes and investment tax credits																	127	[1]	114	[1]	106	[1]
Net Income Attributable to PPL Shareowners																	209		132		173
Cash Flow [Abstract]
Expenditures for long-lived assets																	942		633		490
Balance Sheet Data
Assets	6,846								6,023								6,846		6,023
Pennsylvania Regulated [Member] | Utility Service [Member]
Income Statement Data
Revenues																	1,866	[7]	1,760	[7]	1,881	[7]
Supply [Member]
Income Statement Data
Revenues																	4,602		5,431		6,410
Depreciation																	318		289		245
Amortization																	156	[4]	126	[4]	137	[4]
Unrealized (gains) losses on derivatives, and other hedging activities																	180	[5]	(36)	[5]	(315)	[5]
Interest Expenses																	228		222		192
Income from Continuing Operations Before Income Taxes																	(428)	[5]	662	[5]	1,237	[5]
Income Taxes																	(157)	[6]	247	[6]	463	[6]
Deferred income taxes and investment tax credits																	(296)	[1]	150	[1]	299	[1]
Net Income Attributable to PPL Shareowners																	(272)	[5],[8]	414	[5]	776	[5]
Cash Flow [Abstract]
Expenditures for long-lived assets																	568		736		739
Balance Sheet Data
Assets	11,408								12,868								11,408		12,868
Supply [Member] | Energy [Member]
Income Statement Data
Revenues																	4,075	[5]	4,970	[5]	5,938	[5]
Supply [Member] | Energy Related Businesses [Member]
Income Statement Data
Revenues																	527		461		472
Corporate And Other [Member]
Income Statement Data
Revenues																	13
Depreciation																	31		26		17
Amortization																	6	[4]
Interest Expenses																	33
Income from Continuing Operations Before Income Taxes																	(57)
Income Taxes																	(21)	[6]
Deferred income taxes and investment tax credits																	32	[1]
Net Income Attributable to PPL Shareowners																	(36)
Cash Flow [Abstract]
Expenditures for long-lived assets																	59
Balance Sheet Data
Assets	94	[9]															94	[9]
Intersegment Eliminations [Member] | Pennsylvania Regulated [Member]
Income Statement Data
Revenues																	4		3		11
Intersegment Eliminations [Member] | Supply [Member]
Income Statement Data
Revenues																	51	[10]	79	[10]	26	[10]
PPL Energy Supply LLC [Member]
Income Statement Data
Depreciation																	318		285		244
Amortization																	156		119		137
Unrealized (gains) losses on derivatives, and other hedging activities																	171		(41)		(283)
Interest Expenses																	171		168		174
Income from Continuing Operations Before Income Taxes																	(371)		738		1,212
Income Taxes																	(142)	[11]	263	[11]	445	[11]
Net Income Attributable to PPL Shareowners																	(230)		474		768
Balance Sheet Data
Assets	11,074								12,375								11,074		12,375
Segment (Numeric) [Abstract]
Loss on lease termination for Colstrip coal-fired electric generating facility, pre-tax																	697
Loss on lease termination for Colstrip coal-fired electric generating facility, after-tax																	$ 413

[1] Represents a non-cash expense item that is also included in "Income Taxes."

[2] Quarterly results can vary depending on, among other things, weather and the forward pricing of power. Accordingly, comparisons among quarters of a year may not be indicative of overall trends and changes in operations.

[3] Fourth quarter of 2013 includes a charge for the termination of the lease of the Colstrip coal-fired electric generating facility in Montana. See Note 8 to the Financial Statements for additional information.

[4] Represents non-cash expense items that include amortization of nuclear fuel, regulatory assets, debt discounts and premiums, debt issuance costs, emission allowances and RECs.

[5] Includes unrealized gains and losses from economic activity. See Note 19 for additional information.

[6] Represents both current and deferred income taxes, including investment tax credits.

[7] See Note 1 for additional information on Utility Revenue.

[8] Includes a charge of $697 million ($413 million after tax) for the termination of the lease of the Colstrip coal-fired electric generating facility. See Note 8 for additional information.

[9] Primarily consists of unallocated items, including cash, PP&E and the elimination of inter-segment transactions.

[10] See "PLR Contracts/Purchase of Accounts Receivable" in Note 16 for a discussion of the basis of accounting between reportable segments.

[11] Excludes current and deferred federal, state and foreign tax expense (benefit) recorded to Discontinued Operations of $3 million in 2011. Also, excludes federal, state and foreign tax expense (benefit) recorded to OCI of $47 million in 2013, $(267) million in 2012 and $(83) million in 2011. The deferred tax benefit of operating loss carryforwards was insignificant for 2011.