Stock-Based Compensation Plans (Details 7) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pre-tax stock-based compensation expense	$ 60	$ 89	$ 74
Tax benefit associated with stock-based compensation expense	23	11	10
Stock-based compensation costs capitalized	20	29	21
Restricted Stock and Restricted Stock Units Awards
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pre-tax stock-based compensation expense	42	42	29
Stock Options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pre-tax stock-based compensation expense	0	1	1
Performance Shares
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pre-tax stock-based compensation expense	(10)	5	3
401(k) Savings Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pre-tax stock-based compensation expense	25	37	31
EDCP
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pre-tax stock-based compensation expense	(2)	0	6
DCPD
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pre-tax stock-based compensation expense	5	4	4
FES
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pre-tax stock-based compensation expense	9	13	11
Tax benefit associated with stock-based compensation expense	1	2	2
Stock-based compensation costs capitalized	1	1	0
FES | Restricted Stock and Restricted Stock Units Awards
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pre-tax stock-based compensation expense	6	6	4
FES | Performance Shares
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pre-tax stock-based compensation expense	(1)	1	1
FES | 401(k) Savings Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pre-tax stock-based compensation expense	4	6	5
FES | EDCP
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pre-tax stock-based compensation expense	$ 0	$ 0	$ 1