Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Activities
Net Income	$ 487	$ 486	$ 437
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	896	822	813
Nuclear fuel amortization	38	29	46
Allowance for equity funds used during construction	(14)	(12)	(6)
Deferred income taxes	108	(52)	231
Asset (gains) losses and reserves, net	3	2	(13)
Changes in assets and liabilities
Accounts receivable, net	(30)	24	(62)
Inventories	36	7	(53)
Accounts payable	(23)	(64)	41
Regulatory assets and liabilities	1,029	286	(519)
Accrued pension liability — affiliates	(663)	137	271
Accrued postretirement liability — affiliates	(417)	(221)	157
Other assets	0	30	(7)
Other liabilities	44	42	(9)
Net cash from operating activities	1,488	1,512	1,353
Investing Activities
Plant and equipment expenditures	(1,325)	(1,230)	(1,202)
Restricted cash for debt redemption, principally Securitization	2	5	(3)
Notes receivable from affiliate	(200)	26	77
Proceeds from sale of nuclear decommissioning trust fund assets	1,118	759	833
Investment in nuclear decommissioning trust funds	1,134	764	850
Other investments	(33)	(26)	(32)
Net cash used for investing activities	(1,572)	(1,230)	(1,177)
Financing Activities
Issuance of long-term debt, net of issuance costs	768	496	609
Redemption of long-term debt	(590)	(587)	(554)
Proceeds from Contributions from Parent	400	0	0
Short-term borrowings — other	(130)	130	0
Short-term borrowings — affiliate	(22)	16	64
Dividends on common stock	(342)	(317)	(305)
Other	3	3	7
Net cash used for financing activities	81	(265)	(193)
Net Increase (Decrease) in Cash and Cash Equivalents	(3)	17	(17)
Cash and Cash Equivalents at Beginning of Period	30	13	30
Cash and Cash Equivalents at End of Period	27	30	13
Cash paid (received) for: [Abstract]
Interest (net of interest capitalized)	256	280	294
Income taxes	183	223
Proceeds from Income Tax Refunds			(18)
Supplemental disclosure of non-cash information [Abstract]
Plant and equipment expenditures in accounts payable	$ 231	$ 144	$ 166