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	$ 2,443					631			631
Other comprehensive income (loss)	(134)	$ 0	$ 0	$ 0	$ (134)
Stockholders' Equity, Other	3	0	0	(1)	0
Stockholders' Equity Attributable to Parent at Sep. 30, 2019						7,077	0	561	6,516
Stockholders' Equity Attributable to Parent at Jun. 30, 2019						6,795	0	561	6,234
Net Income (Loss) Attributable to Parent	1,137					282			282
Other comprehensive income (loss)	(191)	0	0	0	(191)
Stockholders' Equity, Other	6	0	0	1	0
Stockholders' Equity Attributable to Parent at Sep. 30, 2019						7,077	0	561	6,516
Stockholders' Equity Attributable to Parent at Dec. 31, 2019	32,449					7,240	0	561	6,679
Net Income (Loss) Attributable to Parent	4,628					700			700
Other comprehensive income (loss)	(177)	0	0	0	(177)
Stockholders' Equity, Other	0	0	(1)	0	0
Stockholders' Equity Attributable to Parent at Sep. 30, 2020	36,768					7,940	0	561	7,379
Stockholders' Equity Attributable to Parent at Jun. 30, 2020						7,600	0	561	7,039
Net Income (Loss) Attributable to Parent	2,842					340			340
Other comprehensive income (loss)	242	0	0	0	242
Stockholders' Equity, Other	1	$ 0	$ 0	$ 0	$ 0
Stockholders' Equity Attributable to Parent at Sep. 30, 2020	$ 36,768					$ 7,940	$ 0	$ 561	$ 7,379