Statements of Operations - MEC - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating revenue:
Total operating revenue	$ 5,283	$ 5,092	$ 14,003	$ 13,254
Operating costs and expenses:
Total operating costs and expenses	3,659	3,507	10,359	9,862
Operating income	1,624	1,585	3,644	3,392
Other income (expense):
Interest expense	(464)	(460)	(1,379)	(1,401)
Allowance for borrowed funds	14	14	34	128
Allowance for equity funds	24	17	59	147
Other, net	2	15	24	26
Total other income (expense)	(392)	(375)	(1,177)	(1,007)
Income before income tax expense and equity income	1,232	1,210	2,467	2,385
Income tax expense	184	199	319	394
Net Income (Loss) Attributable to Parent	1,068	1,036	2,198	2,062
MidAmerican Energy Company [Member]
Operating revenue:
Electric Domestic Regulated Revenue	707	692	1,677	1,572
Gas Domestic Regulated Revenue And Other Revenue	106	103	489	432
Total operating revenue	813	795	2,166	2,004
Operating costs and expenses:
Cost of Domestic Regulated Electric	130	130	342	312
Cost of gas sold and other	54	55	288	237
Utilities Operating Expense, Maintenance and Operations	200	180	547	510
Utilities Operating Expense, Depreciation and Amortization	111	118	369	338
Utilities Operating Expense, Taxes	30	28	90	84
Total operating costs and expenses	525	511	1,636	1,481
Operating income	288	284	530	523
Other income (expense):
Interest expense	(54)	(50)	(160)	(147)
Allowance for borrowed funds	4	3	9	6
Allowance for equity funds	11	6	25	14
Other, net	5	3	13	8
Total other income (expense)	(34)	(38)	(113)	(119)
Income before income tax expense and equity income	254	246	417	404
Income tax expense	(131)	(74)	(207)	(123)
Net Income (Loss) Attributable to Parent	$ 385	$ 320	$ 624	$ 527