Subsidiary Debt - MidAmerican Funding (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Par value	$ 39,634
Equity Restrictions	18,100
Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value	30,883
Other long-term debt	30,672	$ 27,573
MidAmerican Funding [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value	7,515
Other long-term debt	7,427	5,597
MidAmerican Energy Company [Member]
Debt Instrument [Line Items]
Par value	7,276
Other long-term debt	7,208	$ 5,379
Eligible Property Subject To Lien Of Mortgages	20,000
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.65%, Due April 2029 [Member]
Debt Instrument [Line Items]
Par value	850
Other long-term debt	$ 864
Debt Instrument, Interest Rate, Stated Percentage	3.65%	0.00%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 4.25%, Due July 2049 [Member]
Debt Instrument [Line Items]
Par value	$ 900
Other long-term debt	$ 872
Debt Instrument, Interest Rate, Stated Percentage	4.25%	0.00%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.15%, Due April 2050 [Member]
Debt Instrument [Line Items]
Par value	$ 600
Other long-term debt	$ 591
Debt Instrument, Interest Rate, Stated Percentage	3.15%	0.00%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 2.40%, Due March 2019 [Member]
Debt Instrument [Line Items]
Par value	$ 0
Other long-term debt	0	$ 500
Debt Instrument, Interest Rate, Stated Percentage		2.40%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.70%, Due September 2023 [Member]
Debt Instrument [Line Items]
Par value	250
Other long-term debt	$ 249	$ 249
Debt Instrument, Interest Rate, Stated Percentage	3.70%	3.70%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.50%, Due October 2024 [Member]
Debt Instrument [Line Items]
Par value	$ 500
Other long-term debt	$ 501	$ 500
Debt Instrument, Interest Rate, Stated Percentage	3.50%	3.50%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.10%, Due May 2027 [Member]
Debt Instrument [Line Items]
Par value	$ 375
Other long-term debt	$ 373	$ 372
Debt Instrument, Interest Rate, Stated Percentage	3.10%	3.10%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 4.80%, Due September 2043 [Member]
Debt Instrument [Line Items]
Par value	$ 350
Other long-term debt	$ 346	$ 346
Debt Instrument, Interest Rate, Stated Percentage	4.80%	4.80%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 4.40%, Due October 2044 [Member]
Debt Instrument [Line Items]
Par value	$ 400
Other long-term debt	$ 395	$ 395
Debt Instrument, Interest Rate, Stated Percentage	4.40%	4.40%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 4.25%, Due May 2046 [Member]
Debt Instrument [Line Items]
Par value	$ 450
Other long-term debt	$ 445	$ 445
Debt Instrument, Interest Rate, Stated Percentage	4.25%	4.25%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.95%, Due 2047 [Member]
Debt Instrument [Line Items]
Par value	$ 475
Other long-term debt	$ 470	$ 470
Debt Instrument, Interest Rate, Stated Percentage	3.95%	3.95%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.65, Due 2048 [Member]
Debt Instrument [Line Items]
Par value	$ 700
Other long-term debt	$ 688	$ 688
Debt Instrument, Interest Rate, Stated Percentage	3.65%	3.65%
MidAmerican Energy Company [Member] | MEC Notes, 6.75% Series, due 2031 [Member]
Debt Instrument [Line Items]
Par value	$ 400
Other long-term debt	$ 396	$ 396
Debt Instrument, Interest Rate, Stated Percentage	6.75%	6.75%
MidAmerican Energy Company [Member] | MEC Notes, 5.75% Series, due 2035 [Member]
Debt Instrument [Line Items]
Par value	$ 300
Other long-term debt	$ 298	$ 298
Debt Instrument, Interest Rate, Stated Percentage	5.75%	5.75%
MidAmerican Energy Company [Member] | MEC Notes, 5.8% Series, due 2036 [Member]
Debt Instrument [Line Items]
Par value	$ 350
Other long-term debt	$ 348	$ 347
Debt Instrument, Interest Rate, Stated Percentage	5.80%	5.80%
MidAmerican Energy Company [Member] | MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member]
Debt Instrument [Line Items]
Par value	$ 6
Other long-term debt	4	$ 5
MidAmerican Funding, LLC and Subsidiaries [Domain]
Debt Instrument [Line Items]
Equity Restrictions	5,200
MidAmerican Funding LLC [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | Senior Notes, 6.927%, due 2029 [Member]
Debt Instrument [Line Items]
Par value	239
Other long-term debt	$ 219	$ 217
Debt Instrument, Interest Rate, Stated Percentage	6.927%	6.927%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value	$ 7,276
Other long-term debt	7,208	$ 5,380
Eligible Property Subject To Lien Of Mortgages	20,000
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 3.65%, Due April 2029 [Member]
Debt Instrument [Line Items]
Par value	850
Other long-term debt	864
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | Tax-exempt bond obligations, variable rate, due 2023-2047 [Member]
Debt Instrument [Line Items]
Par value	370
Other long-term debt	$ 368	$ 368
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	1.66%	1.74%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 2.40%, Due March 2019 [Member]
Debt Instrument [Line Items]
Par value	$ 0
Other long-term debt	$ 0	$ 500
Debt Instrument, Interest Rate, Stated Percentage	2.40%	2.40%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 3.70%, Due September 2023 [Member]
Debt Instrument [Line Items]
Par value	$ 250
Other long-term debt	$ 249	$ 249
Debt Instrument, Interest Rate, Stated Percentage	3.70%	3.70%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 3.50%, Due October 2024 [Member]
Debt Instrument [Line Items]
Par value	$ 500
Other long-term debt	$ 501	$ 501
Debt Instrument, Interest Rate, Stated Percentage	3.50%	3.50%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 3.10%, Due May 2027 [Member]
Debt Instrument [Line Items]
Par value	$ 375
Other long-term debt	$ 373	$ 372
Debt Instrument, Interest Rate, Stated Percentage	3.10%	3.10%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 4.80%, Due September 2043 [Member]
Debt Instrument [Line Items]
Par value	$ 350
Other long-term debt	$ 346	$ 346
Debt Instrument, Interest Rate, Stated Percentage	4.80%	4.80%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 4.40%, Due October 2044 [Member]
Debt Instrument [Line Items]
Par value	$ 400
Other long-term debt	$ 395	$ 394
Debt Instrument, Interest Rate, Stated Percentage	4.40%	4.40%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 4.25%, Due May 2046 [Member]
Debt Instrument [Line Items]
Par value	$ 450
Other long-term debt	$ 445	$ 445
Debt Instrument, Interest Rate, Stated Percentage	4.25%	4.25%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 3.95%, Due 2047 [Member]
Debt Instrument [Line Items]
Par value	$ 475
Other long-term debt	$ 470	$ 470
Debt Instrument, Interest Rate, Stated Percentage	3.95%	3.95%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 3.65, Due 2048 [Member]
Debt Instrument [Line Items]
Par value	$ 700
Other long-term debt	$ 688	$ 688
Debt Instrument, Interest Rate, Stated Percentage	3.65%	3.65%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC Notes, 6.75% Series, due 2031 [Member]
Debt Instrument [Line Items]
Par value	$ 400
Other long-term debt	$ 396	$ 396
Debt Instrument, Interest Rate, Stated Percentage	6.75%	6.75%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC Notes, 5.75% Series, due 2035 [Member]
Debt Instrument [Line Items]
Par value	$ 300
Other long-term debt	$ 298	$ 298
Debt Instrument, Interest Rate, Stated Percentage	5.75%	5.75%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC Notes, 5.8% Series, due 2036 [Member]
Debt Instrument [Line Items]
Par value	$ 350
Other long-term debt	$ 348	$ 348
Debt Instrument, Interest Rate, Stated Percentage	5.80%	5.80%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member]
Debt Instrument [Line Items]
Par value	$ 6
Other long-term debt	4	$ 5
Vendor Financing, Discount Rate Applied
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Par value	180
MidAmerican Funding LLC [Member] | MidAmerican Funding LLC [Member] | Senior Notes, 6.927%, due 2029 [Member]
Debt Instrument [Line Items]
Par value	239
Other long-term debt	$ 240
Extinguishment of Debt, Gain (Loss), Net of Tax		$ 29
Debt Instrument, Interest Rate, Stated Percentage	6.927%
Minimum [Member] | MidAmerican Energy Company [Member] | MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member]
Debt Instrument [Line Items]
Vendor Financing, Discount Rate Applied	3.42%	3.42%
Minimum [Member] | MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member]
Debt Instrument [Line Items]
Vendor Financing, Discount Rate Applied	3.42%	3.42%
Maximum [Member] | MidAmerican Energy Company [Member] | MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member]
Debt Instrument [Line Items]
Vendor Financing, Discount Rate Applied	4.45%
Maximum [Member] | MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member]
Debt Instrument [Line Items]
Vendor Financing, Discount Rate Applied	4.45%	4.45%
Committed Common Equity Percentage To Regulators Beyond Companies Control [Member] | MidAmerican Energy Company [Member]
Debt Instrument [Line Items]
Common equity to total capitalization percentage below which reasonable efforts to maintain agreed to percentage is not required	39.00%