Compensation and Benefit Plans (Other Postretirement Plan Assets - Fair Value Levels) (Details) (Postretirement Benefits Other Than Pensions, USD $) In Millions, unless otherwise specified	12 Months Ended			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2011	Dec. 31, 2013 Private bond	Dec. 31, 2012 Private bond	Dec. 31, 2013 Undervalued Securities	Dec. 31, 2012 Undervalued Securities	Dec. 31, 2013 Collateralized mortgage obligations and other asset backed securities	Dec. 31, 2012 Collateralized mortgage obligations and other asset backed securities	Dec. 31, 2013 Municipal Notes	Dec. 31, 2012 Municipal Notes	Dec. 31, 2013 Russell 200 and Russell 1000 indexes Corporate stocks	Dec. 31, 2012 Russell 200 and Russell 1000 indexes Corporate stocks	Dec. 31, 2013 Russell 1000 index Common or collective equity funds	Dec. 31, 2012 Russell 1000 index Common or collective equity funds	Dec. 31, 2013 Morgan Stanley Capital International Europe Australasia And Far East Index Equity index fund	Dec. 31, 2012 Morgan Stanley Capital International Europe Australasia And Far East Index Equity index fund	Dec. 31, 2013 MSCI All Country World Index Corporate stocks	Dec. 31, 2012 MSCI All Country World Index Corporate stocks	Dec. 31, 2013 Level 3	Dec. 31, 2012 Level 3	Dec. 31, 2011 Level 3	Dec. 31, 2013 Level 3 Asset backed securities including distressed mortgages	Dec. 31, 2012 Level 3 Asset backed securities including distressed mortgages	Dec. 31, 2013 Southern California Edison	Dec. 31, 2012 Southern California Edison	Dec. 31, 2011 Southern California Edison	Dec. 31, 2013 Southern California Edison Common/collective funds		Dec. 31, 2012 Southern California Edison Common/collective funds		Dec. 31, 2013 Southern California Edison Corporate stocks		Dec. 31, 2012 Southern California Edison Corporate stocks		Dec. 31, 2013 Southern California Edison Corporate notes and bonds securities		Dec. 31, 2012 Southern California Edison Corporate notes and bonds securities		Dec. 31, 2013 Southern California Edison Partnerships/joint ventures		Dec. 31, 2012 Southern California Edison Partnerships/joint ventures		Dec. 31, 2013 Southern California Edison U.S. government and agency securities		Dec. 31, 2012 Southern California Edison U.S. government and agency securities		Dec. 31, 2013 Southern California Edison Registered investment companies		Dec. 31, 2012 Southern California Edison Registered investment companies		Dec. 31, 2013 Southern California Edison Interest-bearing cash	Dec. 31, 2012 Southern California Edison Interest-bearing cash	Dec. 31, 2013 Southern California Edison Other		Dec. 31, 2012 Southern California Edison Other		Dec. 31, 2013 Southern California Edison Level 1	Dec. 31, 2012 Southern California Edison Level 1	Dec. 31, 2013 Southern California Edison Level 1 Common/collective funds		Dec. 31, 2012 Southern California Edison Level 1 Common/collective funds		Dec. 31, 2013 Southern California Edison Level 1 Corporate stocks		Dec. 31, 2012 Southern California Edison Level 1 Corporate stocks		Dec. 31, 2013 Southern California Edison Level 1 Corporate notes and bonds securities		Dec. 31, 2012 Southern California Edison Level 1 Corporate notes and bonds securities		Dec. 31, 2013 Southern California Edison Level 1 Partnerships/joint ventures		Dec. 31, 2012 Southern California Edison Level 1 Partnerships/joint ventures		Dec. 31, 2013 Southern California Edison Level 1 U.S. government and agency securities		Dec. 31, 2012 Southern California Edison Level 1 U.S. government and agency securities		Dec. 31, 2013 Southern California Edison Level 1 Registered investment companies		Dec. 31, 2012 Southern California Edison Level 1 Registered investment companies		Dec. 31, 2013 Southern California Edison Level 1 Interest-bearing cash	Dec. 31, 2012 Southern California Edison Level 1 Interest-bearing cash	Dec. 31, 2013 Southern California Edison Level 1 Other		Dec. 31, 2012 Southern California Edison Level 1 Other		Dec. 31, 2013 Southern California Edison Level 2	Dec. 31, 2012 Southern California Edison Level 2	Dec. 31, 2013 Southern California Edison Level 2 Common/collective funds		Dec. 31, 2012 Southern California Edison Level 2 Common/collective funds		Dec. 31, 2013 Southern California Edison Level 2 Corporate stocks		Dec. 31, 2012 Southern California Edison Level 2 Corporate stocks		Dec. 31, 2013 Southern California Edison Level 2 Corporate notes and bonds securities		Dec. 31, 2012 Southern California Edison Level 2 Corporate notes and bonds securities		Dec. 31, 2013 Southern California Edison Level 2 Partnerships/joint ventures		Dec. 31, 2012 Southern California Edison Level 2 Partnerships/joint ventures		Dec. 31, 2013 Southern California Edison Level 2 U.S. government and agency securities		Dec. 31, 2012 Southern California Edison Level 2 U.S. government and agency securities		Dec. 31, 2013 Southern California Edison Level 2 Registered investment companies		Dec. 31, 2012 Southern California Edison Level 2 Registered investment companies		Dec. 31, 2013 Southern California Edison Level 2 Interest-bearing cash	Dec. 31, 2012 Southern California Edison Level 2 Interest-bearing cash	Dec. 31, 2013 Southern California Edison Level 2 Other		Dec. 31, 2012 Southern California Edison Level 2 Other		Dec. 31, 2013 Southern California Edison Level 3	Dec. 31, 2012 Southern California Edison Level 3	Dec. 31, 2013 Southern California Edison Level 3 Common/collective funds		Dec. 31, 2012 Southern California Edison Level 3 Common/collective funds		Dec. 31, 2013 Southern California Edison Level 3 Corporate stocks		Dec. 31, 2012 Southern California Edison Level 3 Corporate stocks		Dec. 31, 2013 Southern California Edison Level 3 Corporate notes and bonds securities		Dec. 31, 2012 Southern California Edison Level 3 Corporate notes and bonds securities		Dec. 31, 2013 Southern California Edison Level 3 Partnerships/joint ventures		Dec. 31, 2012 Southern California Edison Level 3 Partnerships/joint ventures		Dec. 31, 2013 Southern California Edison Level 3 U.S. government and agency securities		Dec. 31, 2012 Southern California Edison Level 3 U.S. government and agency securities		Dec. 31, 2013 Southern California Edison Level 3 Registered investment companies		Dec. 31, 2012 Southern California Edison Level 3 Registered investment companies		Dec. 31, 2013 Southern California Edison Level 3 Interest-bearing cash	Dec. 31, 2012 Southern California Edison Level 3 Interest-bearing cash	Dec. 31, 2013 Southern California Edison Level 3 Other		Dec. 31, 2012 Southern California Edison Level 3 Other
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value of Plan Assets, Gross										$ 76	$ 73														$ 2,063	$ 1,841		$ 863	[1]	$ 723	[1]	$ 451	[2]	$ 361	[2]	$ 250	[3]	$ 210	[3]	$ 184	[4]	$ 183	[4]	$ 154	[5]	$ 162	[5]	$ 57	[6]	$ 68	[6]	$ 19	$ 24	$ 85	[7]	$ 110	[7]	$ 647	$ 590	$ 0	[1]	$ 0	[1]	$ 451	[2]	$ 361	[2]	$ 0	[3]	$ 0	[3]	$ 0	[4]	$ 0	[4]	$ 118	[5]	$ 131	[5]	$ 52	[6]	$ 68	[6]	$ 19	$ 24	$ 7	[7]	$ 6	[7]	$ 1,252	$ 1,085	$ 863	[1]	$ 723	[1]	$ 0	[2]	$ 0	[2]	$ 250	[3]	$ 210	[3]	$ 20	[4]	$ 17	[4]	$ 36	[5]	$ 31	[5]	$ 5	[6]	$ 0	[6]	$ 0	$ 0	$ 78	[7]	$ 104	[7]	$ 164	$ 166	$ 0	[1]	$ 0	[1]	$ 0	[2]	$ 0	[2]	$ 0	[3]	$ 0	[3]	$ 164	[4]	$ 166	[4]	$ 0	[5]	$ 0	[5]	$ 0	[6]	$ 0	[6]	$ 0	$ 0	$ 0	[7]	$ 0	[7]
Receivables and payables, net								29	20																2	(41)
Net Fair Value of Plan Assets	$ 1,800	$ 2,065	$ 1,570																	$ 164	$ 166	$ 130			$ 2,065	$ 1,800	$ 1,570
Performance percentage benchmark												50.00%	50.00%	60.00%	60.00%	23.00%	23.00%	50.00%	50.00%
Target asset allocation percentage of US equity securities	41.00%			6.00%	6.00%	7.00%	6.00%
Actual plan asset allocations																							78.00%	82.00%

[1] At December 31, 2013 and 2012, respectively, 60% and 60% of the common/collective assets are invested in a large cap index fund which seeks to track performance of the Russell 1000 index. 23% and 23% of the assets in this category are in index funds which seek to track performance in the MSCI Europe, Australasia and Far East (EAFE) Index. 6% and 6% of this category are invested in a privately managed bond fund and 7% and 6% in a fund which invests in equity securities the fund manager believes are undervalue

[2] Corporate stock performance is primarily benchmarked against the Russell Indexes (50% and 50%) and the MSCI All Country World (ACWI) index (50% and 50%) for 2013 and 2012, respectivel

[3] Corporate notes and bonds are diversified and include approximately $29 million and $20 million for commercial collateralized mortgage obligations and other asset backed securities at December 31, 2013 and 2012, respectively.

[4] At December 31, 2013 and 2012, respectively, 78% and 82% of the Level 3 partnerships category is invested in (1) asset backed securities including distressed mortgages, (2) distressed companies and (3) commercial and residential loans and debt and equity of banks.

[5] Level 1 U.S. government and agency securities are U.S. treasury bonds and notes. Level 2 primarily relates to the Federal Home Loan Mortgage Corporation and the Federal National Mortgage Association.

[6] Level 1 registered investment companies consist of an investment grade corporate bond mutual fund and a money market fund.

[7] Other includes $76 million and $73 million of municipal securities at December 31, 2013 and 2012, respectively.