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]
Stockholders' Equity Attributable to Parent at Dec. 31, 2016					$ 5,160	$ 561	$ 4,599
Net Income (Loss) Attributable to Parent	$ 556				105		105
Other comprehensive income (loss)	126	$ 0	$ 0	$ 126
Stockholders' Equity, Other	(11)	0	0	0
Stockholders' Equity Attributable to Parent at Mar. 31, 2017					5,265	561	4,704
Stockholders' Equity Attributable to Parent at Dec. 31, 2017	28,176				5,764	561	5,203
Net Income (Loss) Attributable to Parent	513				106		106
Other comprehensive income (loss)	68	$ 0	$ 0	$ 68
Stockholders' Equity Attributable to Parent at Mar. 31, 2018	$ 28,667				$ 5,870	$ 561	$ 5,309