CONDENSED STATEMENTS OF CONSOLIDATED INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Utility revenues	$ 907	$ 888
Non-utility revenues	1,186	432
Total	2,093	1,320
Expenses:
Utility natural gas	450	438
Non-utility natural gas	1,129	414
Operation and maintenance	220	200
Depreciation and amortization	66	60
Taxes other than income taxes	34	42
Total	1,899	1,154
Operating Income	194	166
Other Income (Expense):
Interest and other finance charges	(29)	(33)
Equity in earnings of unconsolidated affiliate, net	72	60
Total	43	27
Income Before Income Taxes	237	193
Income tax expense	90	73
Net Income	$ 147	$ 120