Statements of Cash Flows - MEC - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Net Income (Loss) Attributable to Parent	$ 2,286	$ 2,198
Allowance for equity funds	(75)	(59)
Deferred income taxes and amortization of investment tax credits	(116)	573
Other Noncash Income (Expense)	40	21
Derivative collateral, net	9	(16)
Pension and other postretirement benefit plans	(61)	(29)
Accrued property, income and other taxes, net	190	390
Net cash flows from operating activities	5,031	5,134
Capital expenditures	(4,203)	(3,179)
Purchases of marketable securities	287	167
Proceeds from sales of marketable securities	266	186
Other, net	48	(12)
Net cash flows from investing activities	(4,517)	(4,354)
Repayments of BHE senior debt and junior subordinated debentures	(650)	(1,344)
Net (repayments of) proceeds from short-term debt	(2,694)	365
Other, net	(32)	(60)
Net cash flows from financing activities	(392)	(330)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	119	456
Cash and cash equivalents and restricted cash and cash equivalents at end of period	1,016
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,402	1,459
MidAmerican Energy Company [Member]
Net Income (Loss) Attributable to Parent	695	624
Depreciation and amortization	499	369
Amortization of Utility Plant to Other Operating Expense	26	25
Allowance for equity funds	(39)	(25)
Deferred income taxes and amortization of investment tax credits	(35)	64
Other Noncash Income (Expense)	13	5
Increase (Decrease) in Accounts Receivable and Other Current Operating Assets	46	29
Increase (Decrease) in Inventories	40	29
Derivative collateral, net	0	3
Pension and other postretirement benefit plans	(10)	(8)
Increase (Decease) in Accounts Payable and Other Current Operating Liabilities	(38)	18
Accrued property, income and other taxes, net	(77)	98
Net cash flows from operating activities	1,028	1,173
Capital expenditures	(1,466)	(1,162)
Purchases of marketable securities	224	126
Proceeds from sales of marketable securities	198	127
Other, net	29	(10)
Net cash flows from investing activities	(1,463)	(1,171)
Proceeds from Issuance of Long-term Debt	687	842
Repayments of BHE senior debt and junior subordinated debentures	(350)	(255)
Net (repayments of) proceeds from short-term debt	0	(99)
Other, net	(1)	0
Net cash flows from financing activities	336	488
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	(99)	490
Cash and cash equivalents and restricted cash and cash equivalents at end of period	115
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 183	$ 516