Statements of Operations - MEC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating revenue:
Total operating revenue	$ 4,993	$ 4,554	$ 9,433	$ 8,720
Operating expenses:
Total operating costs and expenses	4,021	3,509	7,590	6,708
Operating income	972	1,045	1,843	2,012
Other income (expense):
Interest expense	(461)	(457)	(927)	(915)
Allowance for borrowed funds	15	10	27	20
Allowance for equity funds	24	18	45	35
Other, net	1	(1)	31	25
Total other income (expense)	(776)	(401)	(1,362)	(777)
Income before income tax (benefit) expense and equity income	196	644	481	1,235
Income tax (benefit) expense	(168)	83	(389)	135
Net Income (Loss) Attributable to Parent	372	574	885	1,130
MidAmerican Energy Company [Member]
Operating revenue:
Electric Domestic Regulated Revenue	589	537	1,058	970
Gas Domestic Regulated Revenue And Other Revenue	128	121	405	383
Total operating revenue	717	658	1,463	1,353
Operating expenses:
Cost of fuel and energy	118	110	226	212
Cost of gas purchased for resale and other	67	62	246	234
Utilities Operating Expense, Maintenance and Operations	207	186	397	357
Utilities Operating Expense, Depreciation and Amortization	208	141	366	258
Utilities Operating Expense, Taxes	30	29	62	60
Total operating costs and expenses	630	528	1,297	1,121
Operating income	87	130	166	232
Other income (expense):
Interest expense	(56)	(53)	(114)	(106)
Allowance for borrowed funds	4	3	8	5
Allowance for equity funds	13	8	23	14
Other, net	12	7	21	18
Total other income (expense)	(27)	(35)	(62)	(69)
Income before income tax (benefit) expense and equity income	60	95	104	163
Income tax (benefit) expense	(46)	(39)	(108)	(76)
Net Income (Loss) Attributable to Parent	$ 106	$ 134	$ 212	$ 239