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	$ 2,062				527		527
Other comprehensive income (loss)	(110)	$ 0	$ 0	$ (110)	2			2
Dividend, noncash, transfer of operations					90		117	27
Stockholders' Equity, Other	9	0	0	0	(1)		(1)
Stockholders' Equity Attributable to Parent at Sep. 30, 2016					5,143	561	4,583	(1)
Stockholders' Equity Attributable to Parent at Dec. 31, 2016	24,327				5,160	561	4,599	0
Net Income (Loss) Attributable to Parent	2,198				624		624
Other comprehensive income (loss)	1,088	0	0	1,088
Stockholders' Equity, Other	(24)	$ 0	$ 0	$ 0
Stockholders' Equity Attributable to Parent at Sep. 30, 2017	$ 27,473				$ 5,784	$ 561	$ 5,223	$ 0