CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current Assets:
Cash and cash equivalents	$ 20	$ 1
Accounts receivable, net	630	544
Accrued unbilled revenue	206	258
Accounts and notes receivable - affiliated companies	25	15
Materials and supplies	84	83
Inventory	22	145
Non-trading derivative assets	18	36
Prepaid expenses and other current assets	59	133
Total current assets	1,064	1,215
Property, Plant and Equipment:
Property, plant and equipment	9,711	9,615
Less accumulated depreciation and amortization	1,777	1,714
Property, plant and equipment, net	7,934	7,901
Other Assets:
Goodwill	1,468	1,468
Non-trading derivative assets	5	6
Investment in unconsolidated affiliates	400	405
Other	198	195
Total other assets	2,071	2,074
Total Assets	11,069	11,190
Current Liabilities:
Short-term borrowings	0	38
Current portion of long-term debt	524	365
Accounts payable	387	443
Accounts and notes payable — affiliated companies	499	818
Taxes accrued	87	72
Interest accrued	56	48
Customer deposits	80	79
Non-trading derivative liabilities	10	14
Other	134	177
Total current liabilities	1,777	2,054
Other Liabilities:
Accumulated deferred income taxes, net	1,773	1,676
Non-trading derivative liabilities	2	2
Benefit obligations	122	122
Regulatory liabilities	640	619
Other	216	208
Total other liabilities	2,753	2,627
Long-term Debt	2,178	2,276
Commitments and Contingencies (Note 10)
Stockholder’s Equity:
Common stock	0	0
Paid-in capital	2,416	2,416
Retained earnings	1,946	1,818
Accumulated other comprehensive loss	(1)	(1)
Total stockholder’s equity	4,361	4,233
Total Liabilities and Stockholder's Equity	$ 11,069	$ 11,190