CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current Assets:
Cash and Cash Equivalents ($266 and $208 related to VIEs at December 31, 2012 and June 30, 2013, respectively)	$ 344	$ 646
Accounts and notes receivable, net ($68 and $89 related to VIEs at December 31, 2012 and June 30, 2013, respectively)	301	222
Accounts and notes receivable—affiliated companies	27	448
Accrued unbilled revenues	97	80
Inventory	104	94
Taxes receivable	13	7
Deferred tax asset	1	1
Other ($54 and $53 related to VIEs at December 31, 2012 and June 30, 2013, respectively)	62	77
Total current assets	949	1,575
Property, Plant and Equipment:
Property, plant and equipment	8,425	8,204
Less accumulated depreciation and amortization	2,881	2,839
Property, Plant and Equipment, net	5,544	5,365
Regulatory assets ($3,545 and $3,364 related to VIEs at December 31, 2012 and March 31, 2013, respectively)	3,206	3,388
Notes receivable—affiliated companies	750	750
Other	46	41
Total other assets	4,002	4,179
Total Assets	10,495	11,119
Current Liabilities:
Current portion of VIE transition and system restoration bonds long-term debt	417	447
Current portion of other long-term debt	0	450
Accounts payable	87	83
Accounts and notes payable - affiliated companies	177	92
Taxes accrued	54	95
Interest accrued	85	87
Other	115	112
Total current liabilities	935	1,366
Other Liabilities:
Accumulated deferred income taxes, net	2,066	2,097
Benefit obligations	268	268
Regulatory liabilities	497	473
Notes payable—affiliated companies	59	151
Other	43	40
Total other liabilities	2,933	3,029
Long-Term Debt:
VIE transition and system restoration bonds	3,210	3,400
Other	1,595	1,595
Total long-term debt	4,805	4,995
Commitments And Contingencies (Note 8)
Member’s Equity:
Common stock	0	0
Paid-in capital	1,232	1,231
Retained earnings	590	498
Total member’s equity	1,822	1,729
Total Liabilities and Member’s Equity	$ 10,495	$ 11,119