Statements of Cash Flows (Unaudited) - MEC - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net income (loss)	$ 1,926	$ 4,207
Adjustments to reconcile net income to net cash flows from operating activities:
Allowance for equity funds	(123)	(90)
Deferred income taxes and investment tax credits, net	(350)	661
Other, net	53	(88)
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	(246)	(13)
Pension and other postretirement benefit plans	(31)	(37)
Accrued property, income and other taxes, net	501	(29)
Accounts payable and other liabilities	1,125	427
Net cash flows from operating activities	7,939	6,984
Cash flows from investing activities:
Capital expenditures	(5,385)	(4,594)
Purchases of marketable securities	(375)	(243)
Proceeds from sales of marketable securities	961	222
Other, net	16	(71)
Net cash flows from investing activities	(5,469)	(3,528)
Cash flows from financing activities:
Other, net	(273)	(44)
Net cash flows from financing activities	(1,605)	(1,960)
Net change in cash and cash equivalents and restricted cash and cash equivalents	814	1,497
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	1,244	1,445
Cash and cash equivalents and restricted cash and cash equivalents at end of period	2,058	2,942
MEC
Cash flows from operating activities:
Net income (loss)	756	737
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	865	634
Amortization of utility plant to other operating expenses	26	26
Allowance for equity funds	(41)	(25)
Deferred income taxes and investment tax credits, net	11	121
Settlements of asset retirement obligations	(55)	(51)
Other, net	40	42
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	(10)	(331)
Inventories	(38)	34
Pension and other postretirement benefit plans	4	2
Accrued property, income and other taxes, net	197	80
Accounts payable and other liabilities	46	21
Net cash flows from operating activities	1,801	1,290
Cash flows from investing activities:
Capital expenditures	(1,404)	(1,266)
Purchases of marketable securities	(306)	(166)
Proceeds from sales of marketable securities	299	163
Other, net	12	(7)
Net cash flows from investing activities	(1,399)	(1,276)
Cash flows from financing activities:
Dividends paid	(50)	0
Proceeds from long-term debt	0	492
Repayments of long-term debt	(2)	(1)
Other, net	0	(2)
Net cash flows from financing activities	(52)	489
Net change in cash and cash equivalents and restricted cash and cash equivalents	350	503
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	239	45
Cash and cash equivalents and restricted cash and cash equivalents at end of period	$ 589	$ 548