Statements of Operations - MEC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Operating revenue:
Total operating revenue	$ 4,554	$ 4,121	$ 8,720	$ 8,162
Operating costs and expenses:
Total operating costs and expenses	3,505	3,267	6,700	6,355
Operating income	1,049	854	2,020	1,807
Other income (expense):
Interest expense	(457)	(468)	(915)	(941)
Allowance for borrowed funds	10	103	20	114
Allowance for equity funds	18	115	35	130
Other, net	(3)	1	22	11
Total other income (expense)	(405)	(222)	(785)	(632)
Income before income tax expense and equity income	644	632	1,235	1,175
Income tax expense	83	121	135	195
Net Income (Loss) Attributable to Parent	574	536	1,130	1,026
MidAmerican Energy Company [Member]
Operating revenue:
Electric Domestic Regulated Revenue	537	481	970	880
Gas Domestic Regulated Revenue And Other Revenue	121	103	383	329
Total operating revenue	658	584	1,353	1,209
Operating costs and expenses:
Cost of Domestic Regulated Electric	110	90	212	182
Cost of gas sold and other	62	47	234	182
Utilities Operating Expense, Maintenance and Operations	181	170	347	330
Utilities Operating Expense, Depreciation and Amortization	141	110	258	220
Utilities Operating Expense, Taxes	29	28	60	56
Total operating costs and expenses	523	445	1,111	970
Operating income	135	139	242	239
Other income (expense):
Interest expense	(53)	(48)	(106)	(97)
Allowance for borrowed funds	3	2	5	3
Allowance for equity funds	8	4	14	8
Other, net	2	2	8	5
Total other income (expense)	(40)	(40)	(79)	(81)
Income before income tax expense and equity income	95	99	163	158
Income tax expense	(39)	(32)	(76)	(49)
Net Income (Loss) Attributable to Parent	$ 134	$ 131	$ 239	$ 207