Statements of Cash Flows (Unaudited) - MEC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net income (loss)	$ 989	$ (129)
Adjustments to reconcile net income (loss) to net cash flows from operating activities:
Allowance for equity funds	(49)	(38)
Deferred income taxes and investment tax credits, net	(11)	(203)
Other, net	15	6
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	120	333
Pension and other postretirement benefit plans	(7)	(11)
Accrued property, income and other taxes, net	(177)	(347)
Accounts payable and other liabilities	294	91
Net cash flows from operating activities	1,095	2,221
Cash flows from investing activities:
Capital expenditures	(1,848)	(1,553)
Purchases of marketable securities	(106)	(170)
Proceeds from sales of marketable securities	1,091	149
Other, net	0	19
Net cash flows from investing activities	(1,778)	(1,572)
Cash flows from financing activities:
Other, net	(17)	(240)
Net cash flows from financing activities	20	(310)
Net change in cash and cash equivalents and restricted cash and cash equivalents	(662)	338
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	1,155	1,582
MEC
Cash flows from operating activities:
Net income (loss)	242	244
Adjustments to reconcile net income (loss) to net cash flows from operating activities:
Depreciation and amortization	234	250
Amortization of utility plant to other operating expenses	8	9
Allowance for equity funds	(11)	(15)
Deferred income taxes and investment tax credits, net	32	16
Settlements of asset retirement obligations	(6)	(7)
Other, net	8	10
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	131	42
Inventories	(3)	49
Pension and other postretirement benefit plans	(3)	3
Accrued property, income and other taxes, net	(263)	(244)
Accounts payable and other liabilities	(81)	3
Net cash flows from operating activities	288	360
Cash flows from investing activities:
Capital expenditures	(382)	(459)
Purchases of marketable securities	(48)	(105)
Proceeds from sales of marketable securities	42	102
Other, net	4	1
Net cash flows from investing activities	(384)	(461)
Cash flows from financing activities:
Common stock dividend	(100)	0
Repayments of long-term debt	(7)	(1)
Other, net	(1)	1
Net cash flows from financing activities	(108)	0
Net change in cash and cash equivalents and restricted cash and cash equivalents	(204)	(101)
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	$ 64	$ 138