Consolidated Statements of Income and Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues	$ 88	$ 89	$ 287	$ 291
Operating Costs and Expenses
Operations and maintenance	25	26	76	93
Depreciation and amortization	11	11	33	33
Taxes, other than income taxes	4	3	14	15
Total Operating Costs and Expenses	40	40	123	141
Operating Income	48	49	164	150
Other Income (Expense)
Other, net	1	1	1	2
Interest expense, net	(15)	(16)	(46)	(47)
Affiliated interest income, net	0	0	0	1
Total Other Income (Expense)	(14)	(15)	(45)	(44)
Net Income	34	34	119	106
Other Comprehensive Income
Adjustments to postretirement benefit plan liabilities	1	0	1	0
Comprehensive Income	$ 35	$ 34	$ 120	$ 106