Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets
Cash and cash equivalents	$ 0	$ 0
Accounts and note receivable
Customer, net of allowance of $2 in 2010	3	4
Affiliates	3	6
Other	24	20
Materials and supplies	48	48
Deferred income taxes	12	9
Prepaids	16	15
Regulatory assets	8	7
Other	0	4
Total current assets	114	113
Property, plant and equipment, at cost	3,993	3,970
Less accumulated depreciation and amortization	1,525	1,484
Total property, plant and equipment, net	2,468	2,486
Other long-term assets
Note receivable from affiliate	873	836
Other	101	110
Total other long-term assets	974	946
Total assets	3,556	3,545
Accounts payable
Trade	68	82
Affiliates	20	25
Other	9	11
Taxes payable	35	28
Accrued interest	19	18
Accrued liabilities	29	24
Regulatory liabilities	16	7
Contractual deposits	21	15
Other	6	5
Total current liabilities	223	215
Long-term debt	1,113	1,113
Other long-term liabilities
Deferred income taxes	439	408
Other	78	75
Total other long-term liabilities	517	483
Commitments and contingencies (Note 7)
Stockholder's equity
Common stock, par value $1 per share; 1,000 shares authorized, issued and outstanding	0	0
Additional paid-in capital	1,268	1,268
Retained earnings	432	466
Accumulated other comprehensive income	3	0
Total stockholder's equity	1,703	1,734
Total liabilities and stockholder's equity	$ 3,556	$ 3,545