Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating Activities
Net Income	$ 327	$ 235
Adjustments to reconcile net income to net cash from operating activities:
Depreciation, depletion and amortization	280	259
Nuclear fuel amortization	5	9
Allowance for equity funds used during construction	(5)	(3)
Deferred income taxes	77	65
Asset (gains) and losses, reserves and impairments, net	(1)	(6)
Changes in assets and liabilities:
Accounts receivable, net	(270)	(78)
Inventories	147	221
Accounts payable	100	(126)
Gas inventory equalization	142	140
Accrued pension obligation	(23)	(46)
Accrued postretirement obligation	(22)	(154)
Derivative assets and liabilities	(51)	18
Regulatory assets and liabilities	(222)	152
Other assets	50	34
Other liabilities	(2)	(123)
Net cash from operating activities	532	597
Investing Activities
Plant and equipment expenditures — utility	(399)	(309)
Plant and equipment expenditures — non-utility	(98)	(73)
Proceeds from sale of assets	3	4
Restricted cash for debt redemption, principally Securitization	66	57
Proceeds from sale of nuclear decommissioning trust fund assets	271	136
Investment in nuclear decommissioning trust funds	(275)	(140)
Other	(10)	(7)
Net cash used for investing activities	(442)	(332)
Financing Activities
Issuance of long-term debt, net	0	372
Redemption of long-term debt	(115)	(141)
Short-term borrowings, net	244	(240)
Issuance of common stock	0	10
Repurchase of common stock	(50)	0
Dividends on common stock	(116)	(107)
Other	(7)	(6)
Net cash used for financing activities	(44)	(112)
Net Increase (Decrease) in Cash and Cash Equivalents	46	153
Cash and Cash Equivalents at Beginning of Period	52	65
Cash and Cash Equivalents at End of Period	98	218
Supplemental Disclosure of Non-Cash Information
Plant and equipment expenditures in accounts payable	$ 212	$ 219