Consolidated Statements of Changes in Equity - MidAmerican Funding - USD ($) $ in Millions	Total	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income, Net [Member]	MidAmerican Funding, LLC and Subsidiaries [Domain]	MidAmerican Funding, LLC and Subsidiaries [Domain] Additional Paid-in Capital [Member]	MidAmerican Funding, LLC and Subsidiaries [Domain] Retained Earnings [Member]	MidAmerican Funding, LLC and Subsidiaries [Domain] Accumulated Other Comprehensive (Loss) Income, Net [Member]
Stockholders' Equity Attributable to Parent at Dec. 31, 2015					$ 5,525	$ 1,679	$ 3,876	$ (30)
Net Income (Loss) Attributable to Parent	$ 2,062				518		518
Other comprehensive income (loss)	(110)	$ 0	$ 0	$ (110)	2			2
Stockholders' Equity Note, Spinoff Transaction					27			27
Stockholders' Equity Attributable to Parent at Sep. 30, 2016					6,071	1,679	4,393	(1)
Stockholders' Equity, Other	9	1	0	0	(1)		(1)
Stockholders' Equity Attributable to Parent at Dec. 31, 2016	24,327				6,086	1,679	4,407	0
Net Income (Loss) Attributable to Parent	2,198				616		616
Other comprehensive income (loss)	1,088	0	0	1,088
Stockholders' Equity Attributable to Parent at Sep. 30, 2017	27,473				$ 6,702	$ 1,679	$ 5,023	$ 0
Stockholders' Equity, Other	$ (24)	$ (21)	$ 0	$ 0