Segment Information - MidAmerican Funding (Details) $ in Millions	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2016 USD ($) OperatingSegments TheNumberOfReportableSegments	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | OperatingSegments										8
Revenues										$ 17,422	$ 17,880	$ 17,326
Operating income (loss)										4,251	4,328	4,046
Interest expense										1,854	1,904	1,711
Income tax (benefit) expense										403	450	589
Net income (loss) attributable to parent										2,542	2,370	2,095
Payments to Acquire Property, Plant, and Equipment										5,090	5,875	6,555
Assets	$ 85,440				$ 83,618					85,440	83,618	81,816
Goodwill	9,010				9,076					$ 9,010	9,076	9,343
MidAmerican Funding, LLC and Subsidiaries [Domain]
Segment Reporting Information [Line Items]
Number of Reportable Segments | TheNumberOfReportableSegments										2
Electric Domestic Regulated Revenue										$ 1,985	1,837	1,817
Revenues	623	$ 797	$ 585	$ 626	531		$ 576	$ 727	$ 681	2,631	2,515	2,844
Utilities Operating Expense, Depreciation and Amortization										479	407	351
Operating income (loss)	42	284	140	100	29		112	101	209	566	451	395
Interest expense										219	206	197
Income tax (benefit) expense										(139)	(150)	(122)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent					(7)	$ 230	124	95		532	442	393
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent					6	$ 1	5	4		0	16	16
Net income (loss) attributable to parent	14	$ 318	$ 127	$ 73	(1)		$ 129	$ 99	$ 231	532	458	409
Payments to Acquire Property, Plant, and Equipment										1,636	1,446	1,526
Assets	16,747				15,674					16,747	15,674	14,522
Goodwill	1,270				1,270					1,270	1,270
MidAmerican Funding, LLC and Subsidiaries [Domain] | Regulated Electric [Member]
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue										1,985	1,837	1,817
Utilities Operating Expense, Depreciation and Amortization										436	366	312
Operating income (loss)										497	385	319
Interest expense										178	166	157
Income tax (benefit) expense										(156)	(163)	(138)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent										512	413	361
Payments to Acquire Property, Plant, and Equipment										1,564	1,365	1,429
Assets	15,304				14,161					15,304	14,161	13,041
Goodwill	1,191				1,191					1,191	1,191
MidAmerican Funding, LLC and Subsidiaries [Domain] | Regulated Gas [Member]
Segment Reporting Information [Line Items]
Gas Domestic Regulated Revenue										637	661	996
Utilities Operating Expense, Depreciation and Amortization										43	41	39
Operating income (loss)										68	64	75
Interest expense										18	17	17
Income tax (benefit) expense										22	16	22
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent										32	33	40
Payments to Acquire Property, Plant, and Equipment										72	81	97
Assets	1,424				1,330					1,424	1,330	1,296
Goodwill	79				79					79	79
MidAmerican Funding, LLC and Subsidiaries [Domain] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Other Revenue, Net										9	17	31
Operating income (loss)										1	2	1
Interest expense										23	23	23
Income tax (benefit) expense										(5)	(3)	(6)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent										(12)	(4)	(8)
Assets	$ 19				$ 183					$ 19	$ 183	$ 185