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]
Balance at Dec. 31, 2019					$ (1,706)	$ 7,240	$ 0	$ 561	$ 6,679
Net Income (Loss) Attributable to Parent	$ 670					151			151
Other comprehensive income (loss)	(547)	$ 0	$ 0	$ 0	(547)
Stockholders' Equity, Other	(1)	0	(1)	0	0
Balance at Mar. 31, 2020					(2,253)	7,391	0	561	6,830
Balance at Dec. 31, 2020	43,010				(1,552)	8,065	0	561	7,504
Net Income (Loss) Attributable to Parent	4					147			147
Other comprehensive income (loss)	112	0	0	0	112
Stockholders' Equity, Other	3	$ 0	$ 0	$ 1	0
Balance at Mar. 31, 2021	$ 43,089				$ (1,440)	$ 8,212	$ 0	$ 561	$ 7,651