Schedule I Condensed Statements of Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating costs and expenses:
Depreciation and amortization	$ 2,984	$ 2,646	$ 2,591
Total operating costs and expenses	15,715	14,092	13,175
Operating loss	4,072	4,522	4,247
Other income (expense):
Interest expense	(1,838)	(1,841)	(1,854)
Other, net	(9)	(420)	30
Total other income (expense)	(2,107)	(2,015)	(1,397)
Loss before income tax benefit and equity income	1,965	2,507	2,850
Income tax (benefit) expense	(583)	(554)	403
Equity income (loss)	43	(151)	123
Net income	2,591	2,910	2,570
Net income attributable to noncontrolling interests	23	40	28
Net income (loss) attributable to parent	2,568	2,870	2,542
Parent Company [Member]
Operating costs and expenses:
General and administration	21	55	51
Depreciation and amortization	4	4	4
Total operating costs and expenses	25	59	55
Operating loss	(25)	(59)	(55)
Other income (expense):
Interest expense	(438)	(475)	(527)
Other, net	(537)	(369)	37
Total other income (expense)	(975)	(844)	(490)
Loss before income tax benefit and equity income	(1,000)	(903)	(545)
Income tax (benefit) expense	(513)	(335)	(285)
Equity income (loss)	3,058	3,441	2,805
Net income	2,571	2,873	2,545
Net income attributable to noncontrolling interests	3	3	3
Net income (loss) attributable to parent	2,568	2,870	2,542
MidAmerican Funding LLC [Member]
Other income (expense):
Other, net	0	(30)	0
Interest Expense, Long-term Debt	(16)	(22)	(22)
Loss before income tax benefit and equity income	(16)	(52)	(22)
Income tax (benefit) expense	(5)	(22)	(9)
Equity income (loss)	680	604	545
Net income (loss) attributable to parent	$ 669	$ 574	$ 532