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, 2018						$ 6,446	$ 0	$ 561	$ 5,885
Net Income (Loss) Attributable to Parent	$ 1,306					349			349
Other comprehensive income (loss)	57	$ 0	$ 0	$ 0	$ 57
Stockholders' Equity, Other	(3)	0	0	(2)	0
Stockholders' Equity Attributable to Parent at Jun. 30, 2019						6,795	0	561	6,234
Stockholders' Equity Attributable to Parent at Mar. 31, 2019						6,639	0	561	6,078
Net Income (Loss) Attributable to Parent	684					156			156
Other comprehensive income (loss)	(58)	0	0	0	(58)
Stockholders' Equity, Other	(2)	0	0	(1)	0
Stockholders' Equity Attributable to Parent at Jun. 30, 2019						6,795	0	561	6,234
Stockholders' Equity Attributable to Parent at Dec. 31, 2019	32,449					7,240	0	561	6,679
Net Income (Loss) Attributable to Parent	1,786					360			360
Other comprehensive income (loss)	(419)	0	0	0	(419)
Stockholders' Equity, Other	(1)	0	(1)	0	0
Stockholders' Equity Attributable to Parent at Jun. 30, 2020	33,684					7,600	0	561	7,039
Stockholders' Equity Attributable to Parent at Mar. 31, 2020						7,391	0	561	6,830
Net Income (Loss) Attributable to Parent	1,116					209			209
Other comprehensive income (loss)	128	$ 0	$ 0	$ 0	$ 128
Stockholders' Equity Attributable to Parent at Jun. 30, 2020	$ 33,684					$ 7,600	$ 0	$ 561	$ 7,039