Income Taxes (Components of Net Accumulated Deferred Income Tax Liability) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets:
Property and software related	$ 523	$ 600
Unrealized gains and losses	579	491
Loss and credit carryforwards	2,228	1,515
Regulatory balancing accounts	139	80
Pension and PBOPs	264	275
Other	721	723
Sub-total	4,454	3,684
Less valuation allowance	1,380	1,017
Total	3,074	2,667
Deferred tax liabilities:
Property-related	7,879	7,289
Capitalized software costs	318	325
Regulatory balancing accounts	625	296
Unrealized gains and losses	569	477
Other	503	471
Total	9,894	8,858
Accumulated deferred income tax liability, net	6,820	6,191
Included in deferred credits and other liabilities	7,241	6,127
Included in current liabilities (assets)	(421)	64
Southern California Edison
Deferred tax assets:
Property and software related	523	600
Unrealized gains and losses	569	477
Loss and credit carryforwards	427	125
Regulatory balancing accounts	139	80
Pension and PBOPs	86	99
Other	563	625
Sub-total	2,307	2,006
Less valuation allowance	0	0
Total	2,307	2,006
Deferred tax liabilities:
Property-related	7,869	7,279
Capitalized software costs	318	325
Regulatory balancing accounts	625	296
Unrealized gains and losses	569	477
Other	399	379
Total	9,780	8,756
Accumulated deferred income tax liability, net	7,473	6,750
Included in deferred credits and other liabilities	7,737	6,669
Included in current liabilities (assets)	$ (264)	$ 81