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Recent Financing Transactions Recent Financing Transactions - Long-Term Debt (Details) - USD ($) $ in Millions	Apr. 30, 2018	Feb. 28, 2018	Jan. 31, 2018
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%
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%
Subsequent Event [Member] \| 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%
Subsequent Event [Member] \| 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%
Subsequent Event [Member] \| 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%