Statements of Operations - MEC - 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):
Interest expense	(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 Energy Company [Member]
Operating revenue:
Electric Domestic Regulated Revenue	469	433
Gas Domestic Regulated Revenue And Other Revenue	277	262
Total operating revenue	746	695
Operating costs and expenses:
Cost of Domestic Regulated Electric	108	102
Cost of gas sold and other	179	172
Utilities Operating Expense, Maintenance and Operations	190	171
Utilities Operating Expense, Depreciation and Amortization	158	117
Utilities Operating Expense, Taxes	32	31
Total operating costs and expenses	667	593
Operating income	79	102
Other income (expense):
Interest expense	(58)	(53)
Allowance for borrowed funds	4	2
Allowance for equity funds	10	6
Other, net	9	11
Total other income (expense)	(35)	(34)
Income before income tax (benefit) expense and equity income	44	68
Income tax (benefit) expense	(62)	(37)
Net Income (Loss) Attributable to Parent	$ 106	$ 105