Statements of Cash Flows (Unaudited) - MEC - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net income (loss)	$ 2,768	$ 2,285
Adjustments to reconcile net income to net cash flows from operating activities:
Allowance for equity funds	(80)	(56)
Deferred income taxes and investment tax credits, net	385	613
Other, net	37	(26)
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	(317)	(254)
Accrued property, income and other taxes, net	489	76
Accounts payable and other liabilities	682	187
Net cash flows from operating activities	5,147	4,232
Cash flows from investing activities:
Capital expenditures	(3,382)	(2,848)
Purchases of marketable securities	(281)	(185)
Proceeds from sales of marketable securities	257	163
Other, net	(18)	(53)
Net cash flows from investing activities	(3,452)	(2,975)
Cash flows from financing activities:
Other, net	(248)	(19)
Net cash flows from financing activities	(605)	(1,204)
Net change in cash and cash equivalents and restricted cash and cash equivalents	1,057	55
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	2,301	1,500
MEC
Cash flows from operating activities:
Net income (loss)	451	360
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	527	416
Amortization of utility plant to other operating expenses	19	17
Allowance for equity funds	(29)	(14)
Deferred income taxes and investment tax credits, net	58	196
Settlements of asset retirement obligations	(28)	(19)
Other, net	33	11
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	2	(275)
Inventories	8	41
Accrued property, income and other taxes, net	94	56
Accounts payable and other liabilities	(10)	(68)
Net cash flows from operating activities	1,125	721
Cash flows from investing activities:
Capital expenditures	(862)	(720)
Purchases of marketable securities	(214)	(109)
Proceeds from sales of marketable securities	210	105
Other, net	6	(2)
Net cash flows from investing activities	(860)	(726)
Cash flows from financing activities:
Other, net	(1)	(2)
Net cash flows from financing activities	(1)	(2)
Net change in cash and cash equivalents and restricted cash and cash equivalents	264	(7)
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	$ 503	$ 38