Fair Value Measurements (Assets and Liabilities Measured on Recurring Basis Table) (Details) - Recurring [Member] - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014
Assets
Cash and cash equivalents		$ 836	$ 1,399
Short-term investments		0	120
Restricted cash and cash equivalents	[1]	33	31
Price risk management assets:
Foreign currency contracts assets	[2]	209	130
Cross-currency swaps assets	[2]	86	29
Total price risk management assets	[2]	295	159
Auction rate securities	[3]	2	2
Total assets		1,166	1,711
Price risk management liabilities:
Interest rate swaps liabilities	[2]	71	156
Foreign currency contracts liabilities	[2]	1	2
Cross-currency swaps liabilities	[2]	0	3
Total price risk management liabilities	[2]	72	161
Level 1 [Member]
Assets
Cash and cash equivalents		836	1,399
Short-term investments		0	120
Restricted cash and cash equivalents	[1]	33	31
Price risk management assets:
Foreign currency contracts assets		0	0
Cross-currency swaps assets		0	0
Total price risk management assets		0	0
Auction rate securities		0	0
Total assets		869	1,550
Price risk management liabilities:
Interest rate swaps liabilities		0	0
Foreign currency contracts liabilities		0	0
Cross-currency swaps liabilities		0	0
Total price risk management liabilities		0	0
Level 2 [Member]
Assets
Cash and cash equivalents		0	0
Short-term investments		0	0
Restricted cash and cash equivalents		0	0
Price risk management assets:
Foreign currency contracts assets	[2]	209	130
Cross-currency swaps assets	[2]	86	28
Total price risk management assets	[2]	295	158
Auction rate securities		0	0
Total assets		295	158
Price risk management liabilities:
Interest rate swaps liabilities	[2]	71	156
Foreign currency contracts liabilities	[2]	1	2
Cross-currency swaps liabilities		0	3	[2]
Total price risk management liabilities	[2]	72	161
Level 3 [Member]
Assets
Cash and cash equivalents		0	0
Short-term investments		0	0
Restricted cash and cash equivalents		0	0
Price risk management assets:
Foreign currency contracts assets		0	0
Cross-currency swaps assets		0	1	[2]
Total price risk management assets		0	1	[2]
Auction rate securities	[3]	2	2
Total assets		2	3
Price risk management liabilities:
Interest rate swaps liabilities		0	0
Foreign currency contracts liabilities		0	0
Cross-currency swaps liabilities		0	0
Total price risk management liabilities		0	0
PPL Electric Utilities Corp [Member]
Assets
Cash and cash equivalents		47	214
Restricted cash and cash equivalents	[1]	2	3
Price risk management assets:
Total assets		49	217
PPL Electric Utilities Corp [Member] | Level 1 [Member]
Assets
Cash and cash equivalents		47	214
Restricted cash and cash equivalents	[1]	2	3
Price risk management assets:
Total assets		49	217
PPL Electric Utilities Corp [Member] | Level 2 [Member]
Assets
Cash and cash equivalents		0	0
Restricted cash and cash equivalents		0	0
Price risk management assets:
Total assets		0	0
PPL Electric Utilities Corp [Member] | Level 3 [Member]
Assets
Cash and cash equivalents		0	0
Restricted cash and cash equivalents		0	0
Price risk management assets:
Total assets		0	0
LG And E And KU Energy LLC [Member]
Assets
Cash and cash equivalents		30	21
Price risk management assets:
Cash collateral posted to counterparties	[4]	9	21
Total assets		39	42
Price risk management liabilities:
Interest rate swaps liabilities		47	114
Total price risk management liabilities		47	114
LG And E And KU Energy LLC [Member] | Level 1 [Member]
Assets
Cash and cash equivalents		30	21
Price risk management assets:
Cash collateral posted to counterparties	[4]	9	21
Total assets		39	42
Price risk management liabilities:
Interest rate swaps liabilities		0	0
Total price risk management liabilities		0	0
LG And E And KU Energy LLC [Member] | Level 2 [Member]
Assets
Cash and cash equivalents		0	0
Price risk management assets:
Cash collateral posted to counterparties		0	0
Total assets		0	0
Price risk management liabilities:
Interest rate swaps liabilities		47	114
Total price risk management liabilities		47	114
LG And E And KU Energy LLC [Member] | Level 3 [Member]
Assets
Cash and cash equivalents		0	0
Price risk management assets:
Cash collateral posted to counterparties		0	0
Total assets		0	0
Price risk management liabilities:
Interest rate swaps liabilities		0	0
Total price risk management liabilities		0	0
Louisville Gas And Electric Co [Member]
Assets
Cash and cash equivalents		19	10
Price risk management assets:
Cash collateral posted to counterparties	[4]	9	21
Total assets		28	31
Price risk management liabilities:
Interest rate swaps liabilities		47	81
Total price risk management liabilities		47	81
Louisville Gas And Electric Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents		19	10
Price risk management assets:
Cash collateral posted to counterparties	[4]	9	21
Total assets		28	31
Price risk management liabilities:
Interest rate swaps liabilities		0	0
Total price risk management liabilities		0	0
Louisville Gas And Electric Co [Member] | Level 2 [Member]
Assets
Cash and cash equivalents		0	0
Price risk management assets:
Cash collateral posted to counterparties		0	0
Total assets		0	0
Price risk management liabilities:
Interest rate swaps liabilities		47	81
Total price risk management liabilities		47	81
Louisville Gas And Electric Co [Member] | Level 3 [Member]
Assets
Cash and cash equivalents		0	0
Price risk management assets:
Cash collateral posted to counterparties		0	0
Total assets		0	0
Price risk management liabilities:
Interest rate swaps liabilities		0	0
Total price risk management liabilities		0	0
Kentucky Utilities Co [Member]
Assets
Cash and cash equivalents		11	11
Price risk management assets:
Total assets		11	11
Price risk management liabilities:
Interest rate swaps liabilities		0	33
Total price risk management liabilities		0	33
Kentucky Utilities Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents		11	11
Price risk management assets:
Total assets		11	11
Price risk management liabilities:
Interest rate swaps liabilities		0	0
Total price risk management liabilities		0	0
Kentucky Utilities Co [Member] | Level 2 [Member]
Assets
Cash and cash equivalents		0	0
Price risk management assets:
Total assets		0	0
Price risk management liabilities:
Interest rate swaps liabilities		0	33
Total price risk management liabilities		0	33
Kentucky Utilities Co [Member] | Level 3 [Member]
Assets
Cash and cash equivalents		0	0
Price risk management assets:
Total assets		0	0
Price risk management liabilities:
Interest rate swaps liabilities		0	0
Total price risk management liabilities		$ 0	$ 0

[1] Current portion is included in "Other current assets" and long-term portion is included in "Other noncurrent assets" on the Balance Sheets.

[2] Included in "Price risk management assets ", "Other current liabilities", "Other noncurrent assets" and "Other deferred credits and noncurrent liabilities" on the Balance Sheets.

[3] I ncluded in "Other current assets" on the Balance Sheets.

[4] Included in "Other non current assets" on the Balance Sheets. Represents cash collateral posted to offset the exposure with counterparties related to certain interest rate swaps under master netting arrangements that are not offset.