Consolidated Statements of Operations - MidAmerican Funding - 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):
Other Interest and Dividend Income	(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 Funding, LLC and Subsidiaries [Domain]
Operating revenue:
Electric Domestic Regulated Revenue	537	481	970	880
Gas Domestic Regulated Revenue And Other Revenue	122	104	385	331
Total operating revenue	659	585	1,355	1,211
Operating costs and expenses:
Cost of Domestic Regulated Electric	110	90	212	182
Cost of Natural Gas Purchases And Cost of Other Goods And Services Sold	63	48	235	183
Utilities Operating Expense, Maintenance and Operations	180	169	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	1,112	971
Operating income	136	140	243	240
Other income (expense):
Other Interest and Dividend Income	(59)	(55)	(118)	(109)
Allowance for borrowed funds	3	2	5	3
Allowance for equity funds	8	4	14	8
Other, net	2	3	8	6
Total other income (expense)	(46)	(46)	(91)	(92)
Income before income tax expense and equity income	90	94	152	148
Income tax expense	(41)	(33)	(81)	(52)
Net Income (Loss) Attributable to Parent	$ 131	$ 127	$ 233	$ 200