Statements of Cash Flows (Unaudited) - MEC - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net income (loss)	$ 2,064	$ 2,768
Adjustments to reconcile net income to net cash flows from operating activities:
Allowance for equity funds	(110)	(80)
Deferred income taxes and investment tax credits, net	(117)	385
Other, net	(93)	37
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	(60)	(156)
Accrued property, income and other taxes, net	530	489
Accounts payable and other liabilities	52	457
Net cash flows from operating activities	3,665	5,147
Cash flows from investing activities:
Capital expenditures	(4,025)	(3,382)
Purchases of marketable securities	(155)	(281)
Proceeds from sales of marketable securities	1,798	257
Other, net	16	(18)
Net cash flows from investing activities	(3,674)	(3,452)
Cash flows from financing activities:
Other, net	(36)	(248)
Net cash flows from financing activities	625	(605)
Net change in cash and cash equivalents and restricted cash and cash equivalents	623	1,057
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	1,817	1,244
Cash and cash equivalents and restricted cash and cash equivalents at end of period	2,440	2,301
MEC
Cash flows from operating activities:
Net income (loss)	478	451
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	460	527
Amortization of utility plant to other operating expenses	16	19
Allowance for equity funds	(24)	(29)
Deferred income taxes and investment tax credits, net	46	58
Settlements of asset retirement obligations	(15)	(28)
Other, net	3	33
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	203	2
Inventories	(43)	8
Accrued property, income and other taxes, net	107	94
Accounts payable and other liabilities	(106)	(10)
Net cash flows from operating activities	1,125	1,125
Cash flows from investing activities:
Capital expenditures	(763)	(862)
Purchases of marketable securities	(95)	(214)
Proceeds from sales of marketable securities	81	210
Other, net	10	6
Net cash flows from investing activities	(767)	(860)
Cash flows from financing activities:
Common stock dividend	(100)	0
Repayments of long-term debt	(65)	0
Other, net	(1)	(1)
Net cash flows from financing activities	(166)	(1)
Net change in cash and cash equivalents and restricted cash and cash equivalents	192	264
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	268	239
Cash and cash equivalents and restricted cash and cash equivalents at end of period	$ 460	$ 503