Fair Value Measurements (Assets and Liabilities Measured on Recurring Basis Table) (Details) - Recurring [Member] - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Assets
Cash and cash equivalents		$ 814	$ 836
Restricted cash and cash equivalents	[1]	32	33
Price risk management assets:
Foreign currency contracts assets	[2]	249	209
Cross-currency swaps assets	[2]	188	86
Total price risk management assets	[2]	437	295
Auction rate securities	[3]	2	2
Total assets		1,285	1,166
Price risk management liabilities:
Interest rate swaps liabilities	[2]	95	71
Foreign currency contracts liabilities	[2]	3	1
Total price risk management liabilities	[2]	98	72
Level 1 [Member]
Assets
Cash and cash equivalents		814	836
Restricted cash and cash equivalents	[1]	32	33
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		846	869
Price risk management liabilities:
Interest rate swaps liabilities		0	0
Foreign currency contracts liabilities		0	0
Total price risk management liabilities		0	0
Level 2 [Member]
Assets
Cash and cash equivalents		0	0
Restricted cash and cash equivalents		0	0
Price risk management assets:
Foreign currency contracts assets	[2]	249	209
Cross-currency swaps assets	[2]	188	86
Total price risk management assets	[2]	437	295
Auction rate securities		0	0
Total assets		437	295
Price risk management liabilities:
Interest rate swaps liabilities	[2]	95	71
Foreign currency contracts liabilities	[2]	3	1
Total price risk management liabilities	[2]	98	72
Level 3 [Member]
Assets
Cash and cash equivalents		0	0
Restricted cash and cash equivalents		0	0
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	[3]	2	2
Total assets		2	2
Price risk management liabilities:
Interest rate swaps liabilities		0	0
Foreign currency contracts liabilities		0	0
Total price risk management liabilities		0	0
PPL Electric Utilities Corp [Member]
Assets
Cash and cash equivalents		34	47
Restricted cash and cash equivalents	[1]	2	2
Price risk management assets:
Total assets		36	49
PPL Electric Utilities Corp [Member] | Level 1 [Member]
Assets
Cash and cash equivalents		34	47
Restricted cash and cash equivalents	[1]	2	2
Price risk management assets:
Total assets		36	49
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		28	30
Price risk management assets:
Cash collateral posted to counterparties	[4]	8	9
Total assets		36	39
Price risk management liabilities:
Interest rate swaps liabilities		53	47
Total price risk management liabilities		53	47
LG And E And KU Energy LLC [Member] | Level 1 [Member]
Assets
Cash and cash equivalents		28	30
Price risk management assets:
Cash collateral posted to counterparties	[4]	8	9
Total assets		36	39
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		53	47
Total price risk management liabilities		53	47
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		11	19
Price risk management assets:
Cash collateral posted to counterparties	[4]	8	9
Total assets		19	28
Price risk management liabilities:
Interest rate swaps liabilities		53	47
Total price risk management liabilities		53	47
Louisville Gas And Electric Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents		11	19
Price risk management assets:
Cash collateral posted to counterparties	[4]	8	9
Total assets		19	28
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		53	47
Total price risk management liabilities		53	47
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		17	11
Price risk management assets:
Total assets		17	11
Kentucky Utilities Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents		17	11
Price risk management assets:
Total assets		17	11
Kentucky Utilities Co [Member] | Level 2 [Member]
Assets
Cash and cash equivalents		0	0
Price risk management assets:
Total assets		0	0
Kentucky Utilities Co [Member] | Level 3 [Member]
Assets
Cash and cash equivalents		0	0
Price risk management assets:
Total assets		$ 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] Current portion is included in "Price risk management assets" and "Other current liabilities" and n oncurrent portion is included in "Price risk management assets" and "Other deferred credits and noncurrent liabilities" on the Balance Sheets.

[3] Included in "Other noncurrent assets" on the Balance Sheets.

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