Supplemental Cash Flows Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Cash paid (received)
Interest (net of amount capitalized)	$ 62	[1]	$ 168	[1]	$ 290	[1]
Income taxes	(17)		59		(216)
Cash payments under plant operating leases	30		199		311
Details of assets acquired
Fair value of assets acquired	0		0		1
Liabilities assumed	0		0		0
Net assets acquired	0		0		1
Non-cash contribution from parent	25	[2],[3]	0		0
Non-cash distribution to parent	0		222	[2]	0
Non-cash activities from vendor financing	9		11		21
Interest paid	69		199		317
Interest capitalized	7		31		27
Accrued Capital Expenditures	9		31		29
Midwest Generation LLC [Member]
Cash paid (received)
Interest (net of amount capitalized)	24		36		43
Income taxes	0		0		8
Details of assets acquired
Non-cash distribution to parent	0		106	[4]	0
Accrued Capital Expenditures	$ 9		$ 9		$ 4

[1] Interest paid by EME for December 31, 2013, 2012 and 2011 was $69 million, $199 million and $317 million, respectively. Interest capitalized by EME for December 31, 2013, 2012 and 2011 was $7 million, $31 million and $27 million, respectively.

[2] 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.

[3] 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.

[4] 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.