Retirement and Postemployment Benefits (Net Period Defined Benefit Costs (Credits) and Other Changes in Plan Assets and Benefit Obligations) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Pension Benefits United States [Member]
Net Periodic Defined Benefit Costs (Credits): [ Abstract]
Service cost	$ 126		$ 103		$ 95
Interest cost	213		220		217
Expected return on plan assets	(293)		(259)		(245)
Amortization of:
Transition (asset) obligation
Prior service cost (credits)	22		24		24
Actuarial (gain) loss	80		42		30
Net periodic defined benefit costs (credits) prior to settlement charges and termination benefits	148		130		121
Settlement charges			11
Termination benefits
Net periodic defined benefit costs (credits)	148		141		121
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross: [Abstract]
Settlements			(11)
Net (gain) loss	(319)		372		117
Prior service costs (credit)					8
Amortization of: [Abstract]
Transition asset (obligation)
Prior service cost (credit)	(22)		(24)		(24)
Actuarial gain (loss)	(80)		(42)		(30)
Total recognized in OCI and regulatory assets/liabilities	(421)		295		71
Total recognized in net periodic benefit costs, OCI and regulatory assets/liabilities	(273)		436		192
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross (Details) [Abstract]
OCI	(228)		181		47
Regulatory assets/liabilities	(193)		114		24
Total recognized in OCI and regulatory assets/liabilities	(421)		295		71
Estimated Amounts to be Amortized From AOCI and Regulatory Assets into Net Periodic Benefit Costs in the Next Fiscal Period (Details) [Abstract]
Prior service cost (credit)	20
Actuarial (gain) loss	30
Total	50
Amortization from Balance Sheet: [Abstract]
AOCI	22
Regulatory assets/liabilities	28
Total	50
Net Periodic Defined Benefit Costs (Credits) Charged to Operating Expense, Excluding Amounts Charged to Construction and Other Non-expense Accounts (Details) [Abstract]
Net periodic defined benefit costs (credits) charged to operating expense, excluding amounts charged to construction and other non-expense accounts	117		119		98
Pension Benefits United Kingdom [Member]
Net Periodic Defined Benefit Costs (Credits): [ Abstract]
Service cost	69		54		44
Interest cost	320		340		282
Expected return on plan assets	(465)		(458)		(338)
Amortization of:
Transition (asset) obligation
Prior service cost (credits)	1		4		4
Actuarial (gain) loss	150		79		57
Net periodic defined benefit costs (credits) prior to settlement charges and termination benefits	75		19		49
Settlement charges
Termination benefits	3	[1]	2	[1]	50	[1]
Net periodic defined benefit costs (credits)	78		21		99
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross: [Abstract]
Settlements
Net (gain) loss	76		1,073		152
Prior service costs (credit)
Amortization of: [Abstract]
Transition asset (obligation)
Prior service cost (credit)	(1)		(4)		(4)
Actuarial gain (loss)	(150)		(79)		(57)
Total recognized in OCI and regulatory assets/liabilities	(75)	[2]	990	[2]	91	[2]
Total recognized in net periodic benefit costs, OCI and regulatory assets/liabilities	3	[2]	1,011	[2]	190	[2]
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross (Details) [Abstract]
Total recognized in OCI and regulatory assets/liabilities	(75)	[2]	990	[2]	91	[2]
Estimated Amounts to be Amortized From AOCI and Regulatory Assets into Net Periodic Benefit Costs in the Next Fiscal Period (Details) [Abstract]
Prior service cost (credit)
Actuarial (gain) loss	131
Total	131
Amortization from Balance Sheet: [Abstract]
AOCI	131
Regulatory assets/liabilities
Total	131
Net Periodic Defined Benefit Costs (Credits) Charged to Operating Expense, Excluding Amounts Charged to Construction and Other Non-expense Accounts (Details) [Abstract]
Net periodic defined benefit costs (credits) charged to operating expense, excluding amounts charged to construction and other non-expense accounts	33		25		82
Other Postretirement Benefits United States [Member]
Net Periodic Defined Benefit Costs (Credits): [ Abstract]
Service cost	14		12		12
Interest cost	29		31		33
Expected return on plan assets	(25)		(23)		(23)
Amortization of:
Transition (asset) obligation			2		2
Prior service cost (credits)			1
Actuarial (gain) loss	6		4		6
Net periodic defined benefit costs (credits) prior to settlement charges and termination benefits	24		27		30
Settlement charges
Termination benefits
Net periodic defined benefit costs (credits)	24		27		30
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross: [Abstract]
Settlements
Net (gain) loss	(68)		13		(9)
Prior service costs (credit)	(3)		(1)		10
Amortization of: [Abstract]
Transition asset (obligation)			(2)		(2)
Prior service cost (credit)			(1)
Actuarial gain (loss)	(6)		(4)		(6)
Total recognized in OCI and regulatory assets/liabilities	(77)		5		(7)
Total recognized in net periodic benefit costs, OCI and regulatory assets/liabilities	(53)		32		23
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross (Details) [Abstract]
OCI	(41)		12		(6)
Regulatory assets/liabilities	(36)		(7)		(1)
Total recognized in OCI and regulatory assets/liabilities	(77)		5		(7)
Net Periodic Defined Benefit Costs (Credits) Charged to Operating Expense, Excluding Amounts Charged to Construction and Other Non-expense Accounts (Details) [Abstract]
Net periodic defined benefit costs (credits) charged to operating expense, excluding amounts charged to construction and other non-expense accounts	19		22		24
PPL Energy Supply LLC [Member] | Pension Benefits United States [Member]
Net Periodic Defined Benefit Costs (Credits): [ Abstract]
Service cost	7		6		5
Interest cost	8		7		7
Expected return on plan assets	(10)		(9)		(9)
Amortization of:
Actuarial (gain) loss	3		2		2
Net periodic defined benefit costs (credits)	8		6		5
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross: [Abstract]
Net (gain) loss	(15)		16		7
Prior service costs (credit)
Amortization of: [Abstract]
Actuarial gain (loss)	(3)		(2)		(2)
Total recognized in OCI and regulatory assets/liabilities	(18)		14		5
Total recognized in net periodic benefit costs, OCI and regulatory assets/liabilities	(10)		20		10
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross (Details) [Abstract]
Total recognized in OCI and regulatory assets/liabilities	(18)		14		5
Estimated Amounts to be Amortized From AOCI and Regulatory Assets into Net Periodic Benefit Costs in the Next Fiscal Period (Details) [Abstract]
Actuarial (gain) loss	2
Net Periodic Defined Benefit Costs (Credits) Charged to Operating Expense, Excluding Amounts Charged to Construction and Other Non-expense Accounts (Details) [Abstract]
Net periodic defined benefit costs (credits) charged to operating expense, excluding amounts charged to construction and other non-expense accounts	45		37		27
PPL Energy Supply LLC [Member] | Pension Benefits United States [Member] | PPL Services [Member]
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract]
Costs allocated to subsidiary by plan sponsors	38		31		23
PPL Energy Supply LLC [Member] | Other Postretirement Benefits United States [Member]
Net Periodic Defined Benefit Costs (Credits): [ Abstract]
Service cost	1		1		1
Interest cost			1		1
Expected return on plan assets
Amortization of:
Actuarial (gain) loss
Net periodic defined benefit costs (credits)	1		2		2
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross: [Abstract]
Net (gain) loss	(1)				(2)
Prior service costs (credit)	(3)		(1)
Amortization of: [Abstract]
Actuarial gain (loss)
Total recognized in OCI and regulatory assets/liabilities	(4)		(1)		(2)
Total recognized in net periodic benefit costs, OCI and regulatory assets/liabilities	(3)		1
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross (Details) [Abstract]
Total recognized in OCI and regulatory assets/liabilities	(4)		(1)		(2)
Net Periodic Defined Benefit Costs (Credits) Charged to Operating Expense, Excluding Amounts Charged to Construction and Other Non-expense Accounts (Details) [Abstract]
Net periodic defined benefit costs (credits) charged to operating expense, excluding amounts charged to construction and other non-expense accounts	6		6		7
PPL Energy Supply LLC [Member] | Other Postretirement Benefits United States [Member] | PPL Services [Member]
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract]
Costs allocated to subsidiary by plan sponsors	5		5		6
PPL Electric Utilities Corp [Member] | Pension Benefits United States [Member]
Net Periodic Defined Benefit Costs (Credits) Charged to Operating Expense, Excluding Amounts Charged to Construction and Other Non-expense Accounts (Details) [Abstract]
Net periodic defined benefit costs (credits) charged to operating expense, excluding amounts charged to construction and other non-expense accounts	18	[3]	19	[3]	14	[3]
PPL Electric Utilities Corp [Member] | Other Postretirement Benefits United States [Member]
Net Periodic Defined Benefit Costs (Credits) Charged to Operating Expense, Excluding Amounts Charged to Construction and Other Non-expense Accounts (Details) [Abstract]
Net periodic defined benefit costs (credits) charged to operating expense, excluding amounts charged to construction and other non-expense accounts	3	[3]	3	[3]	4	[3]
LG And E And KU Energy LLC [Member] | Pension Benefits United States [Member]
Net Periodic Defined Benefit Costs (Credits): [ Abstract]
Service cost	26		22		24
Interest cost	62		64		67
Expected return on plan assets	(82)		(70)		(64)
Amortization of:
Transition (asset) obligation
Prior service cost (credits)	5		5		5
Actuarial (gain) loss	33		22		24
Net periodic defined benefit costs (credits)	44		43		56
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross: [Abstract]
Net (gain) loss	(116)		96		29
Prior service costs (credit)					8
Amortization of: [Abstract]
Transition asset (obligation)
Prior service cost (credit)	(5)		(5)		(5)
Actuarial gain (loss)	(33)		(22)		(24)
Total recognized in OCI and regulatory assets/liabilities	(154)		69		8
Total recognized in net periodic benefit costs, OCI and regulatory assets/liabilities	(110)		112		64
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross (Details) [Abstract]
OCI	(46)		34		1
Regulatory assets/liabilities	(108)		35		7
Total recognized in OCI and regulatory assets/liabilities	(154)		69		8
Estimated Amounts to be Amortized From AOCI and Regulatory Assets into Net Periodic Benefit Costs in the Next Fiscal Period (Details) [Abstract]
Prior service cost (credit)	5
Actuarial (gain) loss	13
Total	18
Amortization from Balance Sheet: [Abstract]
Total	18
Net Periodic Defined Benefit Costs (Credits) Charged to Operating Expense, Excluding Amounts Charged to Construction and Other Non-expense Accounts (Details) [Abstract]
Net periodic defined benefit costs (credits) charged to operating expense, excluding amounts charged to construction and other non-expense accounts	32		31		40
LG And E And KU Energy LLC [Member] | Other Postretirement Benefits United States [Member]
Net Periodic Defined Benefit Costs (Credits): [ Abstract]
Service cost	5		4		4
Interest cost	8		9		10
Expected return on plan assets	(5)		(4)		(3)
Amortization of:
Transition (asset) obligation			2		2
Prior service cost (credits)	3		3		2
Actuarial (gain) loss			(1)
Net periodic defined benefit costs (credits)	11		13		15
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross: [Abstract]
Net (gain) loss	(14)		(11)		(3)
Prior service costs (credit)					11
Amortization of: [Abstract]
Transition asset (obligation)			(2)		(2)
Prior service cost (credit)	(3)		(3)		(2)
Actuarial gain (loss)			1
Total recognized in OCI and regulatory assets/liabilities	(17)		(15)		4
Total recognized in net periodic benefit costs, OCI and regulatory assets/liabilities	(6)		(2)		19
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross (Details) [Abstract]
OCI	(1)		(1)		2
Regulatory assets/liabilities	(16)		(14)		2
Total recognized in OCI and regulatory assets/liabilities	(17)		(15)		4
Estimated Amounts to be Amortized From AOCI and Regulatory Assets into Net Periodic Benefit Costs in the Next Fiscal Period (Details) [Abstract]
Prior service cost (credit)			2
Actuarial (gain) loss			(1)
Total			1
Amortization from Balance Sheet: [Abstract]
Total			1
Net Periodic Defined Benefit Costs (Credits) Charged to Operating Expense, Excluding Amounts Charged to Construction and Other Non-expense Accounts (Details) [Abstract]
Net periodic defined benefit costs (credits) charged to operating expense, excluding amounts charged to construction and other non-expense accounts	8		9		11
Louisville Gas And Electric Co [Member] | Pension Benefits United States [Member]
Net Periodic Defined Benefit Costs (Credits): [ Abstract]
Service cost	2		2		2
Interest cost	14		14		14
Expected return on plan assets	(20)		(19)		(18)
Amortization of:
Prior service cost (credits)	2		3		2
Actuarial (gain) loss	14		11		11
Net periodic defined benefit costs (credits)	12		11		11
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross: [Abstract]
Net (gain) loss	(20)		18		15
Prior service costs (credit)					9
Amortization of: [Abstract]
Prior service cost (credit)	(2)		(2)		(2)
Actuarial gain (loss)	(14)		(11)		(11)
Total recognized in OCI and regulatory assets/liabilities	(36)		5		11
Total recognized in net periodic benefit costs, OCI and regulatory assets/liabilities	(24)		16		22
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross (Details) [Abstract]
Total recognized in OCI and regulatory assets/liabilities	(36)		5		11
Estimated Amounts to be Amortized From AOCI and Regulatory Assets into Net Periodic Benefit Costs in the Next Fiscal Period (Details) [Abstract]
Prior service cost (credit)	2
Actuarial (gain) loss	6
Total	8
Amortization from Balance Sheet: [Abstract]
Total	8
Net Periodic Defined Benefit Costs (Credits) Charged to Operating Expense, Excluding Amounts Charged to Construction and Other Non-expense Accounts (Details) [Abstract]
Net periodic defined benefit costs (credits) charged to operating expense, excluding amounts charged to construction and other non-expense accounts	14		13		16
Louisville Gas And Electric Co [Member] | Pension Benefits United States [Member] | LKE [Member]
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract]
Costs allocated to subsidiary by plan sponsors	5		5		7
Louisville Gas And Electric Co [Member] | Other Postretirement Benefits United States [Member]
Net Periodic Defined Benefit Costs (Credits) Charged to Operating Expense, Excluding Amounts Charged to Construction and Other Non-expense Accounts (Details) [Abstract]
Net periodic defined benefit costs (credits) charged to operating expense, excluding amounts charged to construction and other non-expense accounts	4		5		5
Louisville Gas And Electric Co [Member] | Other Postretirement Benefits United States [Member] | LKE [Member]
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract]
Costs allocated to subsidiary by plan sponsors	4		5		5
Kentucky Utilities Co [Member] | Pension Benefits United States [Member]
Net Periodic Defined Benefit Costs (Credits) Charged to Operating Expense, Excluding Amounts Charged to Construction and Other Non-expense Accounts (Details) [Abstract]
Net periodic defined benefit costs (credits) charged to operating expense, excluding amounts charged to construction and other non-expense accounts	9	[3]	8	[3]	10	[3]
Kentucky Utilities Co [Member] | Other Postretirement Benefits United States [Member]
Net Periodic Defined Benefit Costs (Credits) Charged to Operating Expense, Excluding Amounts Charged to Construction and Other Non-expense Accounts (Details) [Abstract]
Net periodic defined benefit costs (credits) charged to operating expense, excluding amounts charged to construction and other non-expense accounts	$ 2	[3]	$ 3	[3]	$ 4	[3]

[1] Related to the WPD Midlands separations in the U.K.

[2] WPD is not subject to accounting for the effects of certain types of regulation as prescribed by GAAP. As a result, WPD does not record regulatory assets/liabilities.

[3] PPL Electric and KU do not directly sponsor any defined benefit plans. PPL Electric and KU were allocated these costs of defined benefit plans sponsored by PPL Services (for PPL Electric) and by LKE (for KU), based on their participation in those plans, which management believes are reasonable.