Consolidated Statements of Operations - MidAmerican Funding - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating revenue:
Total operating revenue	$ 4,440	$ 4,166
Operating costs and expenses:
Total operating costs and expenses	3,569	3,199
Operating income	871	967
Other income (expense):
Other Interest and Dividend Income	(466)	(458)
Allowance for borrowed funds	12	10
Allowance for equity funds	21	17
Other, net	30	26
Total other income (expense)	(586)	(376)
Income before income tax (benefit) expense and equity income	285	591
Income tax (benefit) expense	(221)	52
Net Income (Loss) Attributable to Parent	513	556
MidAmerican Funding, LLC and Subsidiaries [Domain]
Operating revenue:
Electric Domestic Regulated Revenue	469	433
Gas Domestic Regulated Revenue And Other Revenue	278	263
Total operating revenue	747	696
Operating costs and expenses:
Cost of Domestic Regulated Electric	108	102
Cost of Natural Gas Purchases And Cost of Other Goods And Services Sold	180	172
Utilities Operating Expense, Maintenance and Operations	190	172
Utilities Operating Expense, Depreciation and Amortization	158	117
Utilities Operating Expense, Taxes	32	31
Total operating costs and expenses	668	594
Operating income	79	102
Other income (expense):
Other Interest and Dividend Income	(63)	(59)
Allowance for borrowed funds	4	2
Allowance for equity funds	10	6
Other, net	10	11
Total other income (expense)	(39)	(40)
Income before income tax (benefit) expense and equity income	40	62
Income tax (benefit) expense	(63)	(40)
Net Income (Loss) Attributable to Parent	$ 103	$ 102