Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net income	$ 666	$ 575
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	715	670
Changes in regulatory assets and liabilities	1	(8)
Deferred income taxes and amortization of investment tax credits	426	276
Other, net	(32)	(27)
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	117	163
Derivative collateral, net	13	13
Contributions to pension and other postretirement benefit plans, net	(95)	(85)
Accrued property, income and other taxes	641	287
Accounts payable and other liabilities	50	(25)
Net cash flows from operating activities	2,502	1,839
Cash flows from investing activities:
Capital expenditures	(1,512)	(1,176)
Acquisitions, net of cash acquired	(106)	0
Purchases of available-for-sale securities	(66)	(88)
Proceeds from sales of available-for-sale securities	57	87
Equity method investments	(264)	(38)
Increase in restricted cash and investments	(315)	(5)
Other, net	9	7
Net cash flows from investing activities	(2,197)	(1,213)
Cash flows from financing activities:
Proceeds from subsidiary debt	1,599	790
Repayments of subsidiary debt	(426)	(502)
Repayment of MEHC subordinated debt	(22)	(22)
Net repayments of short-term debt	(817)	(320)
Other, net	(45)	(20)
Net cash flows from financing activities	289	(74)
Effect of exchange rate changes	0	(1)
Net change in cash and cash equivalents	594	551
Cash and cash equivalents at beginning of period	286	470
Cash and cash equivalents at end of period	$ 880	$ 1,021