Statements of Cash Flows - MEC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net Income (Loss) Attributable to Parent	$ 4	$ 670
Allowance for equity funds	(26)	(34)
Deferred income taxes and amortization of investment tax credits	(135)	47
Other Noncash Income (Expense)	9	63
Trade receivables and other assets	(249)	(118)
Pension and other postretirement benefit plans	(21)	(23)
Accrued property, income and other taxes, net	(453)	(364)
Accounts payable and other liabilities	19	117
Net cash flows from operating activities	1,525	1,165
Capital expenditures	(1,295)	(1,356)
Purchases of marketable securities	(128)	(188)
Proceeds from sales of marketable securities	104	180
Other, net	(29)	43
Net cash flows from investing activities	(1,374)	(1,474)
Net proceeds from (repayments of) short-term debt	409	(1,109)
Other, net	(9)	(32)
Net cash flows from financing activities	(191)	1,358
Net change in cash and cash equivalents and restricted cash and cash equivalents	(39)	1,036
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	1,445	1,268
Cash and cash equivalents and restricted cash and cash equivalents at end of period	1,406	2,304
Derivative collateral, net	14	(19)
MidAmerican Energy Company [Member]
Net Income (Loss) Attributable to Parent	147	151
Depreciation and amortization	207	176
Amortization of Utility Plant to Other Operating Expense	8	9
Allowance for equity funds	(6)	(8)
Deferred income taxes and amortization of investment tax credits	154	91
Asset Retirement Obligation, Cash Paid to Settle	(4)	(2)
Other Noncash Income (Expense)	(4)	14
Trade receivables and other assets	(299)	15
Increase (Decrease) in Inventories	46	(6)
Pension and other postretirement benefit plans	1	(6)
Accrued property, income and other taxes, net	(331)	(286)
Accounts payable and other liabilities	10	70
Net cash flows from operating activities	(85)	219
Capital expenditures	(298)	(472)
Purchases of marketable securities	(52)	(127)
Proceeds from sales of marketable securities	47	124
Other, net	0	5
Net cash flows from investing activities	(303)	(470)
Net proceeds from (repayments of) short-term debt	387	50
Other, net	0	(1)
Net cash flows from financing activities	387	49
Net change in cash and cash equivalents and restricted cash and cash equivalents	(1)	(202)
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	45	330
Cash and cash equivalents and restricted cash and cash equivalents at end of period	44	128
Derivative collateral, net	$ (14)	$ 1