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	$ 885					212			212
Other comprehensive income (loss)	(182)	$ 0	$ 0	$ 0	$ (182)
Stockholders' Equity, Other	(4)	0	(5)	0	0	1			1
Stockholders' Equity Attributable to Parent at Jun. 30, 2018						5,977	0	561	5,416
Stockholders' Equity Attributable to Parent at Mar. 31, 2018						5,870	0	561	5,309
Net Income (Loss) Attributable to Parent	372					106			106
Other comprehensive income (loss)	(250)	0	0	0	(250)
Stockholders' Equity, Other	(4)	0	(5)	0	0	1			1
Stockholders' Equity Attributable to Parent at Jun. 30, 2018						5,977	0	561	5,416
Stockholders' Equity Attributable to Parent at Dec. 31, 2018	29,593					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	30,661					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	$ 30,661					$ 6,795	$ 0	$ 561	$ 6,234