Schedule I Condensed Statements of Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating costs and expenses:
Depreciation and amortization	$ 3,455	$ 3,011	$ 2,984
Total operating costs and expenses	16,661	15,694	15,715
Operating loss	4,291	4,150	4,072
Other income (expense):
Interest expense	(2,021)	(1,912)	(1,838)
Other, net	88	97	(9)
Total other income (expense)	3,180	(1,736)	(2,107)
Loss before income tax benefit and equity income	7,471	2,414	1,965
Income tax (benefit) expense	308	(598)	(583)
Equity income (loss)	(149)	(44)	43
Net income	7,014	2,968	2,591
Net income attributable to noncontrolling interests	71	18	23
Net income (loss) attributable to parent	6,943	2,950	2,568
Dividends, Preferred Stock	26	0	0
Undistributed Earnings (Loss) Available to Common Shareholders, Diluted	6,917	2,950	2,568
Parent Company [Member]
Operating costs and expenses:
General and administration	57	49	21
Depreciation and amortization	4	5	4
Total operating costs and expenses	61	54	25
Operating loss	(61)	(54)	(25)
Other income (expense):
Interest expense	(527)	(452)	(438)
Other, net	4,789	(271)	(537)
Total other income (expense)	4,262	(723)	(975)
Loss before income tax benefit and equity income	4,201	(777)	(1,000)
Income tax (benefit) expense	1,089	(312)	(513)
Equity income (loss)	3,832	3,419	3,058
Net income	6,944	2,954	2,571
Net income attributable to noncontrolling interests	1	3	3
Net income (loss) attributable to parent	6,943	2,951	2,568
Dividends, Preferred Stock	26	0	0
Undistributed Earnings (Loss) Available to Common Shareholders, Diluted	6,917	2,951	2,568
MidAmerican Funding LLC [Member]
Other income (expense):
Interest Expense, Long-term Debt	(16)	(16)	(16)
Loss before income tax benefit and equity income	(16)	(16)	(16)
Income tax (benefit) expense	(5)	(5)	(5)
Equity income (loss)	829	792	680
Net income (loss) attributable to parent	$ 818	$ 781	$ 669