CONDENSED STATEMENTS OF CONSOLIDATED INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Revenues	$ 824	$ 1,183	$ 2,641	$ 3,714
Expenses:
Natural gas	529	880	1,883	2,923
Operation and maintenance	179	179	376	378
Depreciation and amortization	56	51	112	100
Taxes other than income taxes	33	34	83	86
Total	797	1,144	2,454	3,487
Operating Income	27	39	187	227
Other Income (Expense):
Interest and other finance charges	(35)	(34)	(69)	(69)
Equity in earnings of unconsolidated affiliates, net	43	71	95	162
Other, net	(1)	2	1	4
Total	7	39	27	97
Income Before Income Taxes	34	78	214	324
Income tax expense	12	30	83	124
Net Income	$ 22	$ 48	$ 131	$ 200