Statements of Cash Flows - MEC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Income (Loss) Attributable to Parent	$ 513	$ 556
Deferred income taxes and amortization of investment tax credits	(166)	224
Other Noncash Income (Expense)	19	(2)
Derivative collateral, net	(14)	(23)
Pension and other postretirement benefit plans	(21)	(17)
Accrued property, income and other taxes	(60)	(187)
Net cash flows from operating activities	1,479	1,438
Capital expenditures	(1,075)	(865)
Purchases of marketable securities	155	81
Proceeds from sales of marketable securities	132	83
Other, net	31	(12)
Net cash flows from investing activities	(1,223)	(1,538)
Repayments of Long-term Debt	0	(200)
Net (repayments of) proceeds from short-term debt	(1,873)	140
Other, net	(14)	(12)
Net cash flows from financing activities	336	328
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	593	229
Cash and cash equivalents and restricted cash and cash equivalents at end of period	1,644
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,876	1,232
MidAmerican Energy Company [Member]
Net Income (Loss) Attributable to Parent	106	105
Utilities Operating Expense, Depreciation and Amortization	158	117
Deferred income taxes and amortization of investment tax credits	19	13
Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net	10	11
Other Noncash Income (Expense)	(10)	(6)
Increase (Decrease) in Accounts and Other Receivables	23	39
Increase (Decrease) in Inventories	37	22
Derivative collateral, net	(2)	0
Pension and other postretirement benefit plans	(3)	(3)
Increase (Decrease) in Accounts Payable	(58)	1
Accrued property, income and other taxes	(82)	(71)
Increase (Decrease) in Other Current Assets and Liabilities, Net	32	(6)
Net cash flows from operating activities	230	222
Capital expenditures	(365)	(238)
Purchases of marketable securities	95	40
Proceeds from sales of marketable securities	74	35
Other, net	15	(3)
Net cash flows from investing activities	(371)	(246)
Proceeds from Issuance of Long-term Debt	687	843
Repayments of Long-term Debt	(350)	(255)
Net (repayments of) proceeds from short-term debt	0	(99)
Net cash flows from financing activities	337	489
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	196	465
Cash and cash equivalents and restricted cash and cash equivalents at end of period	380
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 478	$ 491