Revenue from Contracts with Customers Revenue from Contracts with Customers - MEC (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2020		Sep. 30, 2019		Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 4,357		$ 4,213		$ 11,190	$ 11,329
Operating revenue	6,193		5,644		15,332	15,148
Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	94		124		314	400
Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3,927		3,753		10,109	10,223
Regulated Operation [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,981		2,968		7,214	7,356
Regulated Operation [Member] | Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	84		77		422	490
Regulated Operation [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	130		69		266	311
Regulated Operation [Member] | Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	42		0		89	1
MidAmerican Energy Company [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	806		793		2,090	2,279
Operating revenue	812		796		2,106	2,297
MidAmerican Energy Company [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	6		3		16	18
MidAmerican Energy Company [Member] | Regulated electric
Disaggregation of Revenue [Line Items]
Operating revenue	728		712		1,717	1,792
MidAmerican Energy Company [Member] | Regulated natural gas
Disaggregation of Revenue [Line Items]
Operating revenue	80		76		384	482
MidAmerican Energy Company [Member] | Corporate and Other [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	4		8		5	23
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	732		712		1,881	1,977
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	287		269		788	829
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	112		111		313	350
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	282		277		649	653
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member] | Natural gas distribution, transportation-only services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	8		7		26	27
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	43	[1]	48	[1]	105	118	[1]
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	56		56		157	232
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Electricity Transmission [Member] | Multi value transmission projects [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	14		17		47	47
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	722		709		1,703	1,776
Operating revenue	728		712		1,717	1,792
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	662		651		1,540	1,561
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric | Regulated retail electric [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	241		228		555	547
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric | Regulated retail electric [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	99		101		242	255
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric | Regulated retail electric [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	280		274		640	641
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric | Regulated retail electric [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	42	[1]	48	[1]	103	118	[1]
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	46		41		116	168
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric | Electricity Transmission [Member] | Multi value transmission projects [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	14		17		47	47
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	6		3		14	16
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	80		76		382	480
Operating revenue	80		76		384	482
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas | Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	70		61		341	416
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas | Regulated retail gas [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	46		41		233	282
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas | Regulated retail gas [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	13		10		71	95
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas | Regulated retail gas [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2		3		9	12
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas | Regulated retail gas [Member] | Natural gas distribution, transportation-only services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	8		7		26	27
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas | Regulated retail gas [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1	[1]	0	[1]	2	0	[1]
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	10		15		41	64
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	0		0		2	2
MidAmerican Energy Company [Member] | Unregulated Operation [Member] | Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4		8		5	23
MidAmerican Energy Company [Member] | Unregulated Operation [Member] | Corporate and Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4		8		5	23
Operating revenue	4		8		5	23
MidAmerican Energy Company [Member] | Unregulated Operation [Member] | Corporate and Other [Member] | Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4		8		5	23
MidAmerican Energy Company [Member] | Unregulated Operation [Member] | Corporate and Other [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	$ 0		$ 0		$ 0	$ 0

[1] Other retail includes provisions for rate refunds, for which any actual refunds will be reflected in the applicable customer classes upon resolution of the related regulatory proceeding.