Consolidated Statements of Changes in Member's Equity (Unaudited) - MidAmerican Funding LLC - USD ($) $ in Millions	Total	Additional Paid-in Capital	MidAmerican Funding, LLC	MidAmerican Funding, LLC Additional Paid-in Capital	MidAmerican Funding, LLC Retained Earnings
Balance at Dec. 31, 2019			$ 8,101	$ 1,679	$ 6,422
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 4,628		695		695
Other equity transactions	0	$ (1)
Balance at Sep. 30, 2020			8,796	1,679	7,117
Balance at Jun. 30, 2020			8,459	1,679	6,780
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	2,842		337		337
Other equity transactions	1
Balance at Sep. 30, 2020			8,796	1,679	7,117
Balance at Dec. 31, 2020	43,010		8,919	1,679	7,240
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	4,207		728		728
Other equity transactions	(3)
Balance at Sep. 30, 2021	45,692		9,647	1,679	7,968
Balance at Jun. 30, 2021			9,273	1,679	7,594
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,922		373		373
Other equity transactions	(2)		1		1
Balance at Sep. 30, 2021	$ 45,692		$ 9,647	$ 1,679	$ 7,968