Consolidated Statements of Changes in Member's 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]
Stockholders' Equity Attributable to Parent at Dec. 31, 2016					$ 6,086	$ 1,679	$ 4,407
Net Income (Loss) Attributable to Parent	$ 1,130				233		233
Other comprehensive income (loss)	422	$ 0	$ 0	$ 422
Stockholders' Equity Attributable to Parent at Jun. 30, 2017					6,319	1,679	4,640
Stockholders' Equity, Other	(23)	(21)	1	0
Stockholders' Equity Attributable to Parent at Dec. 31, 2017	28,176				6,660	1,679	4,981
Net Income (Loss) Attributable to Parent	885				206		206
Other comprehensive income (loss)	(182)	0	$ 0	$ (182)
Stockholders' Equity Attributable to Parent at Jun. 30, 2018	28,175				$ 6,866	$ 1,679	$ 5,187
Stockholders' Equity, Other	$ (4)	$ (5)