CONSOLIDATED STATEMENTS OF TOTAL EQUITY (USD $) In Millions, unless otherwise specified	Total		Common Stock	Additional Paid-in Capital [Member]		Retained Earnings (Deficit)	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interest		Midwest Generation LLC [Member]		Midwest Generation LLC [Member] Common Stock		Midwest Generation LLC [Member] Additional Paid-in Capital [Member]		Midwest Generation LLC [Member] Retained Earnings (Deficit)		Midwest Generation LLC [Member] Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2010	$ 2,821		$ 64	$ 1,336		$ 1,448	$ (31)	$ 4		$ 3,778		$ 0		$ 3,511		$ 270		$ (3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	(1,079)		0	0		(1,078)	0	(1)		(270)		0		0		(270)		0
Other comprehensive loss, net of tax	(63)		0	0		0	(63)	0		(14)		0		0		0		(14)
Cash distribution to parent										(225)		0		0		(225)		0
Payments to Edison International for stock purchases related to stock-based compensation	(5)		0	0		(5)	0	0
Non-cash Contribution From Parent	0
Excess tax benefits related to stock option exercises	2		0	2		0	0	0
Other stock transactions, net	4		0	4		0	0	0
Purchase of noncontrolling interest	(16)		0	(15)		0	0	(1)
Balance at Dec. 31, 2011	1,664		64	1,327		365	(94)	2		3,269		0		3,511		(225)		(17)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	(82)									(9)
Balance at Mar. 31, 2012
Balance at Dec. 31, 2011	1,664		64	1,327		365	(94)	2		3,269		0		3,511		(225)		(17)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	(909)		0	0		(925)	0	16		(1,464)		0		0		(1,464)		0
Other comprehensive loss, net of tax	(44)		0	0		0	(44)	0		(33)		0		0		0		(33)
Non-cash distribution to parent	(222)	[1]	0	(222)	[1]	0	0	0		(106)	[2]	0	[2]	(106)	[2]	0	[2]	0	[2]
Payments to Edison International for stock purchases related to stock-based compensation	(17)		0	0		(17)	0	0
Non-cash Contribution From Parent	0
Excess tax benefits related to stock option exercises	5		0	5		0	0	0
Other stock transactions, net	6		0	6		0	0	0
Contributions from noncontrolling interests	288	[3]	0	0		0	0	288	[3]
Distributions to noncontrolling interests	(18)		0	0		0	0	(18)
Transfers of assets to Capistrano Wind Partners	(21)	[4]	0	(21)	[4]	0	0	0
Balance at Dec. 31, 2012	732		64	1,095		(577)	(138)	288		1,666		0		3,405		(1,689)		(50)
Balance at Sep. 30, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	(561)									(1,401)
Balance at Dec. 31, 2012	732									1,666
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	(82)									(74)
Balance at Mar. 31, 2013
Balance at Dec. 31, 2012	732		64	1,095		(577)	(138)	288		1,666		0		3,405		(1,689)		(50)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	(641)		0	0		(670)	0	29		(633)		0		0		(633)		0
Other comprehensive loss, net of tax	77		0	0		0	77	0		29		0		0		0		29
Payments to Edison International for stock purchases related to stock-based compensation	(14)		0	0		(14)	0	0
Cash Contribution From Parent	12	[1]	0	12	[1]	0	0	0
Non-cash Contribution From Parent	25	[1],[5]	0	25	[1]	0	0	0
Excess tax benefits related to stock option exercises	3		0	3		0	0	0
Other stock transactions, net	2		0	2		0	0	0
Contributions from noncontrolling interests	94	[3]	0	0		0	0	94	[3]
Distributions to noncontrolling interests	(29)		0	0		0	0	(29)
Balance at Dec. 31, 2013	261		64	1,137		(1,261)	(61)	382		1,062		0		3,405		(2,322)		(21)
Balance at Sep. 30, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	(27)									(14)
Balance at Dec. 31, 2013	$ 261									$ 1,062

[1] During 2012, EME recorded a non-cash distribution to EIX related to the tax-allocation agreements. During 2013, EME received contributions from EIX related to the tax-allocation agreements. See Note 7—Income Taxes—EME—Deferred Tax Assets and Liabilities.

[2] During 2012, Midwest Generation recorded a non-cash distribution to its parent related to the tax-allocation agreements. See Note 7—Income Taxes—Midwest Generation—Deferred Tax Assets and Liabilities.

[3] Funds contributed by third-party investors to Capistrano Wind Partners. For further information, see Note 3—Variable Interest Entities—Projects or Entities that are Consolidated—Capistrano Wind Partners.

[4] Additional paid in capital was reduced by $21 million due to a new tax basis in the assets transferred to Capistrano Wind Partners. For further information, see Note 3—Variable Interest Entities—Projects or Entities that are Consolidated—Capistrano Wind Partners.

[5] During 2013, EME received a non-cash contribution from EIX related to the tax-allocation agreements. During 2012, EME recorded a non-cash distribution to EIX related to the tax-allocation agreements. See Note 7—Income Taxes—EME—Deferred Tax Assets and Liabilities.