Subsequent Event (MEC) Subsequent Event - Long-term Debt (Details) (Subsequent Event [Member], MidAmerican Energy Company [Member], MidAmerican Energy Company [Member], USD $) In Millions, unless otherwise specified	Apr. 30, 2014
First Mortgage Bonds, 2.40%, Due March 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 150
Debt Instrument, Interest Rate, Stated Percentage	2.40%
First Mortgage Bonds, 3.50%, Due October 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	300
Debt Instrument, Interest Rate, Stated Percentage	3.50%
First Mortgage Bonds, 4.40%, Due October 2044 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	400
Debt Instrument, Interest Rate, Stated Percentage	4.40%
Notes, 4.65% Series, due 2014 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 350
Debt Instrument, Interest Rate, Stated Percentage	4.65%