Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net income	$ 682	$ 537	$ 555
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	675	640	611
Deferred income taxes and amortization of investment tax credits	230	312	374
Changes in regulatory assets and liabilities	(32)	1	(23)
Other, net	(36)	(32)	(25)
Changes in other operating assets and liabilities:
Accounts receivable and other assets	(7)	(17)	(42)
Derivative collateral, net	43	68	4
Inventories	14	(35)	(59)
Income taxes, net	(26)	118	275
Accounts payable and other liabilities	10	35	(34)
Net cash flows from operating activities	1,553	1,627	1,636
Cash flows from investing activities:
Capital expenditures	(1,065)	(1,346)	(1,506)
Other, net	16	4	(23)
Net cash flows from investing activities	(1,049)	(1,342)	(1,529)
Cash flows from financing activities:
Proceeds from long-term debt	299	749	399
Repayments and redemptions of long-term debt and capital lease obligations	(284)	(102)	(588)
Net (repayments of) proceeds from short-term debt	0	(688)	652
Redemption of Preferred Stock	(40)	0	0
Common stock dividends	(500)	(200)	(550)
Preferred stock dividends	(2)	(2)	(2)
Other, net	(4)	(9)	(2)
Net cash flows from financing activities	(531)	(252)	(91)
Net change in cash and cash equivalents	(27)	33	16
Cash and cash equivalents at beginning of period	80	47	31
Cash and cash equivalents at end of period	$ 53	$ 80	$ 47