Recent Financing Transactions Recent Financing Transactions - Long-Term Debt (Details) - USD ($) $ in Millions	Aug. 31, 2018	Jul. 31, 2018	May 31, 2018	Apr. 30, 2018	Feb. 28, 2018	Jan. 31, 2018
Berkshire Hathaway Energy [Member] | Senior Notes, 4.45%, due 2049 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 1,000
Debt Instrument, Interest Rate, Stated Percentage		4.45%
Northern Natural Gas [Member] | Senior Bonds, 4.30%, due 2049 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 450
Debt Instrument, Interest Rate, Stated Percentage		4.30%
Northern Natural Gas [Member] | Senior Notes, 5.75%, due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount		$ 200
Debt Instrument, Interest Rate, Stated Percentage		5.75%
PacifiCorp [Member] | PAC First Mortgage Bonds, 4.125, Due 2049 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 600
Debt Instrument, Interest Rate, Stated Percentage		4.125%
PacifiCorp [Member] | PAC First Mortgage Bonds, 5.65, Due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount		$ 500
Debt Instrument, Interest Rate, Stated Percentage		5.65%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.65, Due 2048 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 700
Debt Instrument, Interest Rate, Stated Percentage					3.65%
NVE Holdings [Member] | Nevada Power Company [Member] | NPC General and Refunding Mortgage Notes, Series BB [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 575
Debt Instrument, Interest Rate, Stated Percentage				2.75%
NVE Holdings [Member] | Nevada Power Company [Member] | NPC General and Refunding Mortgage Notes, Series O [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount			$ 325
Debt Instrument, Interest Rate, Stated Percentage			6.50%
NVE Holdings [Member] | Nevada Power Company [Member] | NPC General and Refunding Mortgage Notes, Series S [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount	$ 500
Debt Instrument, Interest Rate, Stated Percentage	6.50%
Senior Notes [Member] | Berkshire Hathaway Energy [Member] | Senior Notes, 2.375%, due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 450
Debt Instrument, Interest Rate, Stated Percentage						2.375%
Senior Notes [Member] | Berkshire Hathaway Energy [Member] | Senior Notes, 2.800%, due 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 400
Debt Instrument, Interest Rate, Stated Percentage						2.80%
Senior Notes [Member] | Berkshire Hathaway Energy [Member] | Senior Notes, 3.250%, due 2028 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 600
Debt Instrument, Interest Rate, Stated Percentage						3.25%
Senior Notes [Member] | Berkshire Hathaway Energy [Member] | Senior Notes, 3.80%, due 2048 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 750
Debt Instrument, Interest Rate, Stated Percentage						3.80%