Statements of Cash Flows - MEC - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Net Income (Loss) Attributable to Parent	$ 885	$ 1,130
Allowance for equity funds	(45)	(35)
Deferred income taxes and amortization of investment tax credits	(264)	341
Other Noncash Income (Expense)	26	8
Derivative collateral, net	(5)	(13)
Pension and other postretirement benefit plans	(23)	(25)
Accrued property, income and other taxes, net	174	(244)
Net cash flows from operating activities	2,818	2,428
Capital expenditures	(2,779)	(1,813)
Purchases of marketable securities	209	122
Proceeds from sales of marketable securities	184	127
Other, net	43	(6)
Net cash flows from investing activities	(3,019)	(2,481)
Repayments of BHE senior debt and junior subordinated debentures	(650)	(950)
Net (repayments of) proceeds from short-term debt	(1,048)	617
Other, net	(23)	(31)
Net cash flows from financing activities	465	112
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	261	62
Cash and cash equivalents and restricted cash and cash equivalents at end of period	1,224
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,544	1,065
MidAmerican Energy Company [Member]
Net Income (Loss) Attributable to Parent	212	239
Utilities Operating Expense, Depreciation and Amortization	366	258
Amortization of Utility Plant to Other Operating Expense	17	17
Allowance for equity funds	(23)	(14)
Deferred income taxes and amortization of investment tax credits	(10)	27
Other Noncash Income (Expense)	7	(1)
Increase (Decrease) in Accounts Receivable and Other Current Operating Assets	(1)	(16)
Increase (Decrease) in Inventories	45	30
Derivative collateral, net	0	2
Pension and other postretirement benefit plans	(7)	(5)
Increase (Decease) in Accounts Payable and Other Current Operating Liabilities	(97)	(75)
Accrued property, income and other taxes, net	140	(83)
Net cash flows from operating activities	651	411
Capital expenditures	(818)	(545)
Purchases of marketable securities	147	81
Proceeds from sales of marketable securities	125	77
Other, net	27	(3)
Net cash flows from investing activities	(813)	(552)
Proceeds from Issuance of Long-term Debt	687	843
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	489
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	174	348
Cash and cash equivalents and restricted cash and cash equivalents at end of period	369
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 456	$ 374