Defined Benefits (Details) (USD $) In Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010	Sep. 30, 2011		Sep. 30, 2010		Dec. 31, 2010
Health Care Reform (Numeric) [Abstract]
Decrease in deferred tax assets as a result of the Health Care Reform						$ 13
Increase in regulatory assets as a result of the Health Care Reform						9
Increase in deferred tax liability as a result of the Health Care Reform						4
Effect of Health Care Reform on income tax expense	0		0	0		8	[1]
Pension Benefits - U.S. [Member]
Net Periodic Defined Benefit Costs (Credits) [Line Items]
Service cost	24		15	71		45
Interest cost	54		37	163		111
Expected return on plan assets	(61)		(43)	(184)		(131)
Amortization of:
Prior service cost	6		5	18		15
Actuarial (gain) loss	7		0	21		2
Net periodic defined benefit costs (credits) prior to termination benefits	30		14	89		42
Termination benefits	0		0	0		0
Net periodic defined benefit costs (credits)	30		14	89		42
Pension Benefits - U.K. [Member]
Net Periodic Defined Benefit Costs (Credits) [Line Items]
Service cost	14		4	31		13
Interest cost	88		38	200		113
Expected return on plan assets	(103)		(51)	(243)		(150)
Amortization of:
Prior service cost	1		1	3		3
Actuarial (gain) loss	15		12	44		36
Net periodic defined benefit costs (credits) prior to termination benefits	15		4	35		15
Termination benefits	45	[2]	0	47	[2]	0
Net periodic defined benefit costs (credits)	60		4	82		15
Expected contribution to pension plans	111			111				15
Cash contributions to the pension plan				102
Contributions required to fund the acquired WPD Midlands' plan				27
PPL WW contributions to prepay future contribution requirements to fund pension plan deficits				69
Contributions expected to be made to the early retirement deficiency costs in 2011	43			43
Other Postretirement Benefits - U.S. [Member]
Net Periodic Defined Benefit Costs (Credits) [Line Items]
Service cost	3		2	9		6
Interest cost	9		6	25		20
Expected return on plan assets	(6)		(5)	(17)		(15)
Amortization of:
Transition obligation	0		1	1		5
Prior service cost	0		0	0		4
Actuarial (gain) loss	1		2	4		4
Net periodic defined benefit costs (credits)	$ 7		$ 6	$ 22		$ 24

[1] Beginning in 2013, provisions within Health Care Reform eliminated the income tax deductibility of retiree health care costs to the extent of federal subsidies received by plan sponsors that provide retiree prescription drug benefits equivalent to Medicare Part D Coverage. As a result, PPL recorded deferred income tax expense in the first quarter of 2010. See Note 9 for additional information.

[2] WPD Midlands recorded early retirement deficiency costs payable under applicable pension plans related to employees leaving the WPD Midlands companies. See Note 8 for additional information.