UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flow from operating activities
Net (loss) income	$ 149	$ 180
Change in derivative financial instrument assets and liabilities	53	(1)
Depreciation and amortization	126	119
Deferred income taxes	105	50
Inventories	4	4
Energy marketing receivables and energy marketing trade payables, net (Note 2)	118	154
Deferred natural gas costs	3	(30)
Gas, unbilled and other receivables, net of allowance	247	241
Accrued expenses	(52)	(31)
Gas and trade payables	(54)	(63)
Other - net	(139)	(69)
Net cash flow provided by operating activities	560	554
Cash flows from investing activities
Payments to acquire property, plant and equipment	(292)	(370)
Proceeds from disposition of assets	0	73
Other	0	(4)
Net cash flow used in investing activities	(292)	(301)
Cash flows from financing activities
Net payments and borrowings of short-term debt	(732)	73
Payment of senior notes	(300)	0
Dividends paid on common shares	(102)	(99)
Distribution to noncontrolling interest (Note 8)	(16)	(27)
Purchase of treasury shares	(2)	(5)
Issuance of senior notes	1,014	0
Purchase of additional 15% ownership interest in SouthStar	0	(58)
Payments of gas facility revenue bonds	0	(160)
Benefit dividend reinvestment and stock purchase plans	11	11
Net cash flow used in financing activities	(127)	(265)
Net increase (decrease) in cash and cash equivalents	141	(12)
Cash and cash equivalents at beginning of period	24	26
Cash and cash equivalents at end of period	165	14
Cash paid during the period for
Interest	95	87
Income taxes	$ 10	$ 54