Leases (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Future minimum operating lease payments
2013	$ 210
2014	202
2015	206
2016	201
2017	123
Years thereafter	1,678
Total minimum lease payments	2,620
Lease Payments
Future minimum operating lease payments
2013	256
2014	250
2015	246
2016	214
2017	126
Years thereafter	1,678
Total minimum lease payments	2,770
Capital Trusts
Future minimum operating lease payments
2013	46
2014	48
2015	40
2016	13
2017	3
Years thereafter	0
Total minimum lease payments	150
FES
Future minimum operating lease payments
2013	144
2014	143
2015	141
2016	130
2017	81
Years thereafter	1,581
Total minimum lease payments	2,220
OE
Future minimum operating lease payments
2013	146	[1]
2014	145	[1]
2015	145	[1]
2016	116	[1]
2017	46	[1]
Years thereafter	3	[1]
Total minimum lease payments	601	[1]
JCP&L
Future minimum operating lease payments
2013	9
2014	8
2015	7
2016	8
2017	7
Years thereafter	52
Total minimum lease payments	$ 91

[1] Includes certain minimum lease payments associated with NG's lessor equity interests in Perry and Beaver Valley Unit 2 that are eliminated in consolidation.