Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Reconciliation of Unrecognized Tax Benefits
Balance at January 1,	$ 815		$ 812		$ 631
Tax positions taken during the current year, Increases	65		19		33
Tax positions taken during a prior year, Increases	1		43		177
Tax positions taken during a prior year, Decreases	(143)	[1]	(109)	[1]	(11)	[1]
Tax positions taken during a prior year: Increases (decreases) - deconsolidation of EME	0	[2]	50	[2]	(18)	[2]
Tax positions taken during a prior year, Decreases for settlements during the period	(162)	[3]	0	[3]	0	[3]
Balance at December 31,	576		815		812
Southern California Edison
Reconciliation of Unrecognized Tax Benefits
Balance at January 1,	532		571		373
Tax positions taken during the current year, Increases	57		22		35
Tax positions taken during a prior year, Increases	0		45		169
Tax positions taken during a prior year, Decreases	(93)	[1]	(106)	[1]	(6)	[1]
Tax positions taken during a prior year: Increases (decreases) - deconsolidation of EME	0	[2]	0	[2]	0	[2]
Tax positions taken during a prior year, Decreases for settlements during the period	(55)	[3]	0	[3]	0	[3]
Balance at December 31,	$ 441		$ 532		$ 571

[1] Decreases in prior year tax positions relate primarily to re-measurement of uncertain tax positions in connection with the settlement of the 2003 – 2006 IRS audit.

[2] Unrecognized tax benefits of EME have been deconsolidated as a result of the bankruptcy filing by EME, except for tax liabilities for which Edison International and EME are jointly liable under the Internal Revenue Code and applicable state statutes. See Note 15 for further information. During 2013, Edison International increased the amount of unrecognized tax benefits related to the taxable gain on sale of EME’s international assets by approximately $50 million as a result of unfavorable developments during the fourth quarter of 2013.

[3] In the fourth quarter of 2014, Edison International has settled all open tax positions with the IRS for taxable year 2003 through 2006. Edison International has previously made cash deposits which are sufficient to settle all outstanding liabilities for this audit cycle. Total liabilities included tax reserves, previously settled issues and the associated interest and penalties.