Statements of Cash Flows - MEC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income attributable to parent	$ 2,721	$ 5,790	$ 6,943
Adjustments to reconcile net income to net cash flows from operating activities:
Allowance for equity funds	(167)	(126)	(165)
Deferred income taxes and investment tax credits, net	(467)	646	1,880
Other, net	59	(57)	(23)
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	20	553	(1,318)
Pension and other postretirement benefit plans	(27)	(39)	(65)
Accrued property, income and other taxes, net	397	(489)	(134)
Accounts payable and other liabilities	751	163	501
Net cash flows from operating activities	9,359	8,692	6,224
Cash flows from investing activities:
Capital expenditures	(7,505)	(6,611)	(6,765)
Purchases of marketable securities	(574)	(297)	(370)
Proceeds from sales of marketable securities	2,464	273	325
Other, net	12	(74)	76
Net cash flows from investing activities	(7,750)	(5,763)	(13,165)
Cash flows from financing activities:
Other, net	(274)	(70)	(162)
Net cash flows from financing activities	(1,006)	(3,131)	7,103
Net change in cash and cash equivalents and restricted cash and cash equivalents	573	(201)	177
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	1,244	1,445	1,268
Cash and cash equivalents and restricted cash and cash equivalents at end of period	1,817	1,244	1,445
MEC
Cash flows from operating activities:
Net income attributable to parent	961	894	826
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	1,168	914	716
Amortization of utility plant to other operating expenses	35	34	34
Allowance for equity funds	(51)	(39)	(45)
Deferred income taxes and investment tax credits, net	33	153	208
Settlements of asset retirement obligations	(85)	(103)	(124)
Other, net	51	21	(18)
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	(11)	(293)	48
Inventories	(43)	44	(52)
Pension and other postretirement benefit plans	8	(4)	(19)
Accrued property, income and other taxes, net	40	(71)	(64)
Accounts payable and other liabilities	68	67	33
Net cash flows from operating activities	2,174	1,617	1,543
Cash flows from investing activities:
Capital expenditures	(1,869)	(1,912)	(1,836)
Purchases of marketable securities	(499)	(213)	(281)
Proceeds from sales of marketable securities	492	207	269
Proceeds from sales of other investments	0	0	2
Other investment proceeds	2	1	9
Other, net	7	6	11
Net cash flows from investing activities	(1,867)	(1,911)	(1,826)
Cash flows from financing activities:
Common stock dividends	(275)	0	0
Proceeds from long-term debt	0	492	0
Repayments of long-term debt	(2)	(1)	0
Other, net	(1)	(3)	(2)
Net cash flows from financing activities	(278)	488	(2)
Net change in cash and cash equivalents and restricted cash and cash equivalents	29	194	(285)
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	239	45	330
Cash and cash equivalents and restricted cash and cash equivalents at end of period	$ 268	$ 239	$ 45