Consolidated Statements of Cash Flows (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net income	$ 994	$ 959
Adjustments to reconcile net income to net cash flows from operating activities:
Loss (gain) on other items, net	5	(52)
Depreciation and amortization	997	950
Changes in regulatory assets and liabilities	(7)	25
Deferred income taxes and amortization of investment tax credits	475	572
Other, net	(59)	(32)
Changes in other operating assets and liabilities:
Trade receivables and other assets	60	174
Derivative collateral, net	32	(93)
Contributions to pension and other postretirement benefit plans, net	(132)	(139)
Accounts payable and other liabilities	352	(284)
Net cash flows from operating activities	2,717	2,080
Cash flows from investing activities:
Capital expenditures	(1,912)	(1,862)
Purchases of available-for-sale securities	(105)	(77)
Proceeds from sales of available-for-sale securities	102	65
Proceeds from sales of assets and business, net	8	140
Other, net	(86)	(63)
Net cash flows from investing activities	(1,993)	(1,797)
Cash flows from financing activities:
Repayments of MEHC subordinated debt	(122)	(259)
Proceeds from subsidiary debt	790	231
Repayments of subsidiary debt	(601)	(142)
Net (repayments of) proceeds from short-term debt	(320)	55
Net purchases of common stock	0	(56)
Other, net	(36)	(19)
Net cash flows from financing activities	(289)	(190)
Effect of exchange rate changes	1	(1)
Net change in cash and cash equivalents	436	92
Cash and cash equivalents at beginning of period	470	429
Cash and cash equivalents at end of period	$ 906	$ 521