Statements of Changes in Shareholder's Equity - MEC - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [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] Additional Paid-in Capital [Member]	MidAmerican Energy Company [Member] Retained Earnings [Member]
Stockholders' Equity Attributable to Parent at Dec. 31, 2017						$ 5,764	$ 0	$ 561	$ 5,203
Net Income (Loss) Attributable to Parent	$ 513					106			106
Other comprehensive income (loss)	68	$ 0	$ 0	$ 0	$ 68
Stockholders' Equity Attributable to Parent at Mar. 31, 2018						5,870	0	561	5,309
Stockholders' Equity Attributable to Parent at Dec. 31, 2018	29,593					6,446	0	561	5,885
Net Income (Loss) Attributable to Parent	622					193			193
Other comprehensive income (loss)	115	$ 0	$ 0	0	$ 115
Stockholders' Equity, Other	(1)			$ (1)
Stockholders' Equity Attributable to Parent at Mar. 31, 2019	$ 30,036					$ 6,639	$ 0	$ 561	$ 6,078