Segment Information - MidAmerican Funding (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) OperatingSegments TheNumberOfReportableSegments	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | OperatingSegments	8
Revenues	$ 19,844	$ 19,787	$ 18,614
Operating income (loss)	4,150	4,072	4,522
Interest expense	1,912	1,838	1,841
Income tax (benefit) expense	(598)	(583)	(554)
Net income (loss) attributable to parent	2,950	2,568	2,870
Payments to Acquire Property, Plant, and Equipment	7,364	6,241	4,571
Assets	100,051	92,189	90,208
Goodwill	$ 9,722	9,595	9,678
MidAmerican Funding, LLC and Subsidiaries [Domain]
Segment Reporting Information [Line Items]
Number of Reportable Segments | TheNumberOfReportableSegments	2
Revenues	$ 2,927	3,053	2,846
Utilities Operating Expense, Depreciation and Amortization	639	609	500
Operating income (loss)	549	550	544
Interest expense	302	247	237
Income tax (benefit) expense	(377)	(262)	(202)
Net income (loss) attributable to parent	781	669	574
Payments to Acquire Property, Plant, and Equipment	2,810	2,332	1,773
Assets	21,840	19,202	17,621
Goodwill	1,270	1,270
MidAmerican Funding, LLC and Subsidiaries [Domain] | Electricity, US Regulated [Member]
Segment Reporting Information [Line Items]
Revenues	2,237	2,283	2,108
Utilities Operating Expense, Depreciation and Amortization	593	565	458
Operating income (loss)	473	469	472
Interest expense	259	208	196
Income tax (benefit) expense	(384)	(273)	(212)
Net income (loss) attributable to parent	739	628	570
Payments to Acquire Property, Plant, and Equipment	2,684	2,223	1,686
Assets	20,284	17,702	16,105
Goodwill	1,191	1,191
MidAmerican Funding, LLC and Subsidiaries [Domain] | Natural Gas, US Regulated [Member]
Segment Reporting Information [Line Items]
Revenues	660	754	719
Utilities Operating Expense, Depreciation and Amortization	46	44	42
Operating income (loss)	71	81	72
Interest expense	22	19	18
Income tax (benefit) expense	12	16	29
Net income (loss) attributable to parent	52	54	35
Payments to Acquire Property, Plant, and Equipment	126	109	87
Assets	1,547	1,485	1,482
Goodwill	79	79
MidAmerican Funding, LLC and Subsidiaries [Domain] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Revenues	30	16	19
Operating income (loss)	5	0	0
Interest expense	21	20	23
Income tax (benefit) expense	(5)	(5)	(19)
Net income (loss) attributable to parent	(10)	(13)	(31)
Assets	$ 9	$ 15	$ 34