Consolidated Statements of Changes in Equity - MEC - USD ($) $ in Millions	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income, Net [Member]	MidAmerican Energy Company [Member]	MidAmerican Energy Company [Member] Common Stock [Member]	MidAmerican Energy Company [Member] Retained Earnings [Member]	MidAmerican Energy Company [Member] Accumulated Other Comprehensive (Loss) Income, Net [Member]
Stockholders' Equity Attributable to Parent at Dec. 31, 2014					$ 4,250	$ 561	$ 3,712	$ (23)
Net Income (Loss) Attributable to Parent	$ 469				94		94
Other comprehensive income (loss)	(235)	$ 0	$ 0	$ (235)	2			2
Stockholders' Equity Attributable to Parent at Mar. 31, 2015					4,346	561	3,806	(21)
Stockholders' Equity Attributable to Parent at Dec. 31, 2015	22,401				4,705	561	4,174	(30)
Net Income (Loss) Attributable to Parent	490				76		76
Other comprehensive income (loss)	99	$ 0	$ 0	$ 99	1			1
Dividend, Noncash, Spin-off Of Operations					90		117	27
Stockholders' Equity Attributable to Parent at Mar. 31, 2016	$ 22,990				$ 4,692	$ 561	$ 4,133	$ (2)