Statements of Changes in Equity - MEC - USD ($) $ in Millions	Total	Common Stock [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] Retained Earnings [Member]	MidAmerican Energy Company [Member] Accumulated Other Comprehensive (Loss) Income, Net [Member]
Stockholders' Equity Attributable to Parent at Dec. 31, 2015					$ 4,705	$ 561	$ 4,174	$ (30)
Net Income (Loss) Attributable to Parent	$ 1,026				207		207
Other comprehensive income (loss)	(71)	$ 0	$ 0	$ (71)	2			2
Dividend, noncash, transfer of operations					90		117	27
Stockholders' Equity, Other	10	0		0	(1)		(1)
Stockholders' Equity Attributable to Parent at Jun. 30, 2016					4,823	561	4,263	(1)
Stockholders' Equity Attributable to Parent at Dec. 31, 2016	24,327				5,160	561	4,599	0
Net Income (Loss) Attributable to Parent	1,130				239		239
Other comprehensive income (loss)	422	0	0	422
Stockholders' Equity, Other	(23)	$ 0	$ 1	$ 0	(1)		(1)
Stockholders' Equity Attributable to Parent at Jun. 30, 2017	$ 25,740				$ 5,398	$ 561	$ 4,837	$ 0