CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current Assets:
Cash and cash equivalents ($266 and $166 related to VIEs at December 31, 2012 and March 31, 2013, respectively)	$ 206	$ 646
Accounts and notes receivable, net ($68 and $65 related to VIEs at December 31, 2012 and March 31, 2013, respectively)	227	222
Accounts and notes receivable—affiliated companies	201	448
Accrued unbilled revenues	70	80
Inventory	97	94
Taxes receivable	0	7
Deferred tax asset	1	1
Other ($54 and $53 related to VIEs at December 31, 2012 and March 31, 2013, respectively)	62	77
Total current assets	864	1,575
Property, Plant and Equipment:
Property, plant and equipment	8,321	8,204
Less accumulated depreciation and amortization	2,880	2,839
Property, Plant and Equipment, net	5,441	5,365
Other Assets:
Regulatory assets ($3,545 and $3,470 related to VIEs at December 31, 2012 and March 31, 2013, respectively)	3,309	3,388
Notes receivable—affiliated companies	750	750
Other	41	41
Total other assets	4,100	4,179
Total Assets	10,405	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	90	83
Accounts and notes payable - affiliated companies	32	92
Taxes accrued	49	95
Interest accrued	49	87
Other	112	112
Total current liabilities	749	1,366
Other Liabilities:
Accumulated deferred income taxes, net	2,089	2,097
Benefit obligations	267	268
Regulatory liabilities	495	473
Notes payable—affiliated companies	151	151
Other	41	40
Total other liabilities	3,043	3,029
Long-Term Debt:
VIE transition and system restoration bonds	3,269	3,400
Other	1,595	1,595
Total long-term debt	4,864	4,995
Commitments And Contingencies (Note 8)
Member’s Equity:
Common stock	0	0
Paid-in capital	1,232	1,231
Retained earnings	517	498
Total member’s equity	1,749	1,729
Total Liabilities and Member’s Equity	$ 10,405	$ 11,119