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]
Stockholders' Equity Attributable to Parent at Dec. 31, 2016					$ 6,086	$ 1,679	$ 4,407
Net Income (Loss) Attributable to Parent	$ 556				102		102
Other comprehensive income (loss)	126	$ 0	$ 0	$ 126
Stockholders' Equity Attributable to Parent at Mar. 31, 2017					6,188	1,679	4,509
Stockholders' Equity, Other	(11)	(8)	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	513				103		103
Other comprehensive income (loss)	68	$ 0	$ 0	$ 68
Stockholders' Equity Attributable to Parent at Mar. 31, 2018	$ 28,667				$ 6,763	$ 1,679	$ 5,084