Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Receivables, allowances for uncollectible accounts (in dollars)	$ 66	$ 75
Utility property, plant and equipment, accumulated depreciation (in dollars)	7,578	7,424
Nonutility property, plant and equipment, accumulated depreciation (in dollars)	69	123
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized	800,000,000	800,000,000
Common stock, shares issued	325,811,206	325,811,206
Common stock, shares outstanding	325,811,206	325,811,206
Southern California Edison
Receivables, allowances for uncollectible accounts (in dollars)	66	75
Utility property, plant and equipment, accumulated depreciation (in dollars)	7,578	7,424
Nonutility property, plant and equipment, accumulated depreciation (in dollars)	$ 63	$ 117
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized	560,000,000	560,000,000
Common stock, shares issued	434,888,104	434,888,104
Common stock, shares outstanding	434,888,104	434,888,104