Fair Value Measurements (Assets and Liabilities Measured on Recurring Basis Table) (Details) - Recurring [Member] - USD ($) $ in Millions		Dec. 31, 2016	Dec. 31, 2015
Assets
Cash and cash equivalents		$ 341	$ 836
Restricted cash and cash equivalents	[1]	26	33
Price risk management assets:
Foreign currency contracts	[2]	211	209
Cross-currency swaps	[2]	188	86
Total price risk management assets	[2]	399	295
Auction rate securities		0	2	[3]
Total assets		766	1,166
Price risk management liabilities:
Interest rate swaps	[2]	31	71
Foreign currency contracts	[2]	27	1
Total price risk management liabilities	[2]	58	72
Level 1 [Member]
Assets
Cash and cash equivalents		341	836
Restricted cash and cash equivalents	[1]	26	33
Price risk management assets:
Foreign currency contracts		0	0
Cross-currency swaps		0	0
Total price risk management assets		0	0
Auction rate securities		0	0
Total assets		367	869
Price risk management liabilities:
Interest rate swaps		0	0
Foreign currency contracts		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	[2]	211	209
Cross-currency swaps	[2]	188	86
Total price risk management assets	[2]	399	295
Auction rate securities		0	0
Total assets		399	295
Price risk management liabilities:
Interest rate swaps	[2]	31	71
Foreign currency contracts	[2]	27	1
Total price risk management liabilities	[2]	58	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		0	0
Cross-currency swaps		0	0
Total price risk management assets		0	0
Auction rate securities		0	2	[3]
Total assets		0	2
Price risk management liabilities:
Interest rate swaps		0	0
Foreign currency contracts		0	0
Total price risk management liabilities		0	0
PPL Electric Utilities Corp [Member]
Assets
Cash and cash equivalents		13	47
Restricted cash and cash equivalents	[1]	2	2
Price risk management assets:
Total assets		15	49
PPL Electric Utilities Corp [Member] | Level 1 [Member]
Assets
Cash and cash equivalents		13	47
Restricted cash and cash equivalents	[1]	2	2
Price risk management assets:
Total assets		15	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		13	30
Price risk management assets:
Cash collateral posted to counterparties	[4]	3	9
Total assets		16	39
Price risk management liabilities:
Interest rate swaps		31	47
Total price risk management liabilities		31	47
LG And E And KU Energy LLC [Member] | Level 1 [Member]
Assets
Cash and cash equivalents		13	30
Price risk management assets:
Cash collateral posted to counterparties	[4]	3	9
Total assets		16	39
Price risk management liabilities:
Interest rate swaps		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		31	47
Total price risk management liabilities		31	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		0	0
Total price risk management liabilities		0	0
Louisville Gas And Electric Co [Member]
Assets
Cash and cash equivalents		5	19
Price risk management assets:
Cash collateral posted to counterparties	[4]	3	9
Total assets		8	28
Price risk management liabilities:
Interest rate swaps		31	47
Total price risk management liabilities		31	47
Louisville Gas And Electric Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents		5	19
Price risk management assets:
Cash collateral posted to counterparties	[4]	3	9
Total assets		8	28
Price risk management liabilities:
Interest rate swaps		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		31	47
Total price risk management liabilities		31	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		0	0
Total price risk management liabilities		0	0
Kentucky Utilities Co [Member]
Assets
Cash and cash equivalents		7	11
Price risk management assets:
Total assets		7	11
Kentucky Utilities Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents		7	11
Price risk management assets:
Total assets		7	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] "Price risk management assets" and "Other current liabilities" and noncurrent portion is included in "Price risk management assets" and "Other deferred credits and noncurrent liabilities" on the Balance Sheets.

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

[4] Included in "Other noncurrent 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.