CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current Assets:
Cash and cash equivalents ($290 and $207 related to VIEs, respectively)	$ 290	$ 207
Accounts and notes receivable, net ($58 and $60 related to VIEs, respectively), less bad debt reserve of $3 and $3, respectively	237	261
Accounts and notes receivable—affiliated companies	119	5
Accrued unbilled revenues	96	87
Inventory	126	105
Taxes receivable	103	0
Deferred tax asset	2	3
Other ($47 and $41 related to VIEs, respectively)	74	65
Total current assets	1,047	733
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment, net	6,343	5,834
Other Assets:
Regulatory assets ($2,738 and $3,179 related to VIEs, respectively)	2,629	3,001
Other	34	43
Total other assets	2,663	3,044
Total Assets	10,053	9,611
Current Liabilities:
Current portion of VIE transition and system restoration bonds long-term debt	372	354
Accounts payable	148	137
Accounts and notes payable—affiliated companies	121	80
Taxes accrued	104	144
Interest accrued	75	75
Other	109	128
Total current liabilities	929	918
Other Liabilities:
Deferred Tax Liabilities, Net, Noncurrent	2,001	2,020
Benefit obligations	260	227
Regulatory liabilities	537	509
Other	54	46
Total other liabilities	2,852	2,802
Long-Term Debt:
VIE transition and system restoration bonds	2,674	3,046
Other long-term debt	2,006	1,595
Total long-term debt	4,680	4,641
Commitments And Contingencies (Note 10)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Member’s Equity	1,592	1,250
Total Liabilities and Member’s Equity	$ 10,053	$ 9,611