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	$ 2,198				616		616
Other comprehensive income (loss)	1,088	$ 0	$ 0	$ 1,088
Stockholders' Equity Attributable to Parent at Sep. 30, 2017					6,702	1,679	5,023
Stockholders' Equity, Other	(24)	(21)	0	0
Stockholders' Equity Attributable to Parent at Dec. 31, 2017	28,176				6,660	1,679	4,981
Net Income (Loss) Attributable to Parent	2,286				685		685
Other comprehensive income (loss)	(184)	0	$ 0	$ (184)
Stockholders' Equity Attributable to Parent at Sep. 30, 2018	29,557				$ 7,345	$ 1,679	$ 5,666
Stockholders' Equity, Other	$ (5)	$ (5)