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	$ 2,286					695			695
Other comprehensive income (loss)	(184)	$ 0	$ 0	$ 0	$ (184)
Stockholders' Equity, Other	(5)	0	(5)	0	0
Stockholders' Equity Attributable to Parent at Sep. 30, 2018						6,459	0	561	5,898
Stockholders' Equity Attributable to Parent at Jun. 30, 2018						5,977	0	561	5,416
Net Income (Loss) Attributable to Parent	1,401					483			483
Other comprehensive income (loss)	(2)	0	0	0	(2)
Stockholders' Equity, Other	(1)	0	0	0	0	(1)			(1)
Stockholders' Equity Attributable to Parent at Sep. 30, 2018						6,459	0	561	5,898
Stockholders' Equity Attributable to Parent at Dec. 31, 2018	29,593					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	31,608					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	$ 31,608					$ 7,077	$ 0	$ 561	$ 6,516