Statements of Operations - MEC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating revenue:
Total operating revenue	$ 4,166	$ 4,041
Operating costs and expenses:
Total operating costs and expenses	3,195	3,088
Operating income	971	953
Other income (expense):
Interest expense	(458)	(473)
Allowance for borrowed funds	10	11
Allowance for equity funds	17	15
Other, net	25	10
Total other income (expense)	(380)	(410)
Income before income tax expense and equity income	591	543
Income tax expense	52	74
Net Income (Loss) Attributable to Parent	556	490
MidAmerican Energy Company [Member]
Operating revenue:
Electric Domestic Regulated Revenue	433	399
Gas Domestic Regulated Revenue And Other Revenue	262	226
Total operating revenue	695	625
Operating costs and expenses:
Cost of Domestic Regulated Electric	102	92
Cost of gas sold and other	172	135
Utilities Operating Expense, Maintenance and Operations	166	160
Utilities Operating Expense, Depreciation and Amortization	117	110
Utilities Operating Expense, Taxes	31	28
Total operating costs and expenses	588	525
Operating income	107	100
Other income (expense):
Interest expense	(53)	(49)
Allowance for borrowed funds	2	1
Allowance for equity funds	6	4
Other, net	6	3
Total other income (expense)	(39)	(41)
Income before income tax expense and equity income	68	59
Income tax expense	(37)	(17)
Net Income (Loss) Attributable to Parent	$ 105	$ 76