Subsidiary Debt Subsidiary Debt - SPPC (Details) - USD ($) $ in Billions	Dec. 31, 2019	Dec. 31, 2018
PacifiCorp [Member]
Debt Instrument [Line Items]
Eligible Property Subject To Lien Of Mortgages	$ 29.0
MidAmerican Energy Company and Subsidiaries [Member]
Debt Instrument [Line Items]
Eligible Property Subject To Lien Of Mortgages	20.0
Nevada Power Company [Member]
Debt Instrument [Line Items]
Eligible Property Subject To Lien Of Mortgages	8.7
Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Eligible Property Subject To Lien Of Mortgages	$ 4.2
First Mortgage Bonds, 3.50% to 7.70%, Due 2029 to 2031 [Member] | PacifiCorp [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		7.70%
First Mortgage Bonds, 4.125%, Due 2049 [Member] | PacifiCorp [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.13%
MEC First Mortgage Bonds, 3.65, Due 2048 [Member] | MidAmerican Energy Company and Subsidiaries [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.65%	3.65%
MEC First Mortgage Bonds, 4.25%, Due July 2049 [Member] | MidAmerican Energy Company and Subsidiaries [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.25%	0.00%
MEC First Mortgage Bonds, 3.65%, Due April 2029 [Member] | MidAmerican Energy Company and Subsidiaries [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.65%	0.00%
Guaranteed Bonds, 2.75%, due May 2049 [Member] | Northern Electric Plc [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.75%
MEC First Mortgage Bonds, 3.15%, Due April 2050 [Member] | MidAmerican Energy Company and Subsidiaries [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.15%	0.00%
Bonds, 2.25%, due 2059 [Member] | Northern Powergrid Holdings [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.25%
Subsidiary Debt [Member] | MidAmerican Funding [Member] | MidAmerican Energy Company [Member]
Debt Instrument [Line Items]
Eligible Property Subject To Lien Of Mortgages	$ 20.0
Subsidiary Debt [Member] | MidAmerican Funding [Member] | MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member] | MidAmerican Energy Company [Member]
Debt Instrument [Line Items]
Vendor Financing, Discount Rate Applied
Subsidiary Debt [Member] | MidAmerican Funding [Member] | MEC First Mortgage Bonds, 3.65, Due 2048 [Member] | MidAmerican Energy Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.65%	3.65%
Subsidiary Debt [Member] | NV Energy [Member] | Mortgage Securities, 2.750%, Series BB due 2020 [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.75%	2.75%
Subsidiary Debt [Member] | NV Energy [Member] | Pollution Control Refunding Revenue Bonds, 1.850%, Series 2016B, due 2029 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.85%	0.00%
Subsidiary Debt [Member] | NV Energy [Member] | Water facilities refunding revenue bonds, series 2016C, due 2036 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.85%
Subsidiary Debt [Member] | NV Energy [Member] | Water facilities refunding revenue bonds, series 2016D, due 2036 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.05%
Subsidiary Debt [Member] | NV Energy [Member] | Water facilities refunding revenue bonds, series 2016E, due 2036 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.05%
Subsidiary Debt [Member] | NV Energy [Member] | Water facilities refunding revenue bonds, series 2016F, due 2036 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.05%	0.00%
Subsidiary Debt [Member] | NV Energy [Member] | Water facilities refunding revenue bonds, series 2016G, due 2036 [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.85%	0.00%
Subsidiary Debt [Member] | NV Energy [Member] | Mortgage Securities, 3.700%, Series CC due 2029 [Member] | Nevada Power Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.70%	0.00%
Minimum [Member] | First Mortgage Bonds, 3.50% to 7.70%, Due 2029 to 2031 [Member] | PacifiCorp [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.50%
Minimum [Member] | First Mortgage Bonds, 4.125%, Due 2049 [Member] | PacifiCorp [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.13%
Minimum [Member] | MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member] | MidAmerican Energy Company and Subsidiaries [Member]
Debt Instrument [Line Items]
Vendor Financing, Discount Rate Applied	3.42%	3.42%
Minimum [Member] | Subsidiary Debt [Member] | MidAmerican Funding [Member] | MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member] | MidAmerican Energy Company [Member]
Debt Instrument [Line Items]
Vendor Financing, Discount Rate Applied	3.42%	3.42%
Maximum [Member] | First Mortgage Bonds, 3.50% to 7.70%, Due 2029 to 2031 [Member] | PacifiCorp [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.70%	7.70%
Maximum [Member] | First Mortgage Bonds, 4.125%, Due 2049 [Member] | PacifiCorp [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.15%
Maximum [Member] | MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member] | MidAmerican Energy Company and Subsidiaries [Member]
Debt Instrument [Line Items]
Vendor Financing, Discount Rate Applied	4.45%
Maximum [Member] | Subsidiary Debt [Member] | MidAmerican Funding [Member] | MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member] | MidAmerican Energy Company [Member]
Debt Instrument [Line Items]
Vendor Financing, Discount Rate Applied	4.45%	4.45%