Consolidated Statements of Cash Flows (USD $) In Millions	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net income	$ 575	$ 587
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	670	630
Changes in regulatory assets and liabilities	(8)	22
Deferred income taxes and amortization of investment tax credits	276	150
Other, net	(27)	(14)
Changes in other operating assets and liabilities:
Trade receivables and other assets	163	273
Derivative collateral, net	13	(44)
Contributions to pension and other postretirement benefit plans, net	(85)	(119)
Accounts payable and other liabilities	262	(80)
Net cash flows from operating activities	1,839	1,405
Cash flows from investing activities:
Capital expenditures	(1,176)	(1,278)
Purchases of available-for-sale securities	(88)	(54)
Proceeds from sales of available-for-sale securities	87	55
Proceeds from sale of assets	5	80
Other, net	(41)	(34)
Net cash flows from investing activities	(1,213)	(1,231)
Cash flows from financing activities:
Repayments of MEHC subordinated debt	(22)	(67)
Proceeds from subsidiary debt	790	0
Repayments of subsidiary debt	(502)	(119)
Net (repayments of) proceeds from short-term debt	(320)	127
Net purchases of common stock	0	(56)
Other, net	(20)	(14)
Net cash flows from financing activities	(74)	(129)
Effect of exchange rate changes	(1)	(3)
Net change in cash and cash equivalents	551	42
Cash and cash equivalents at beginning of period	470	429
Cash and cash equivalents at end of period	$ 1,021	$ 471