Consolidated Statements of Capitalization (MEC) Consolidated Statements of Capitalization (MEC) (Parenthetical) (MidAmerican Energy Company [Member], USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
MEC First Mortgage Bonds, 2.40%, Due 2019 [Member]
Stated interest rate	2.40%
MEC First Mortgage Bonds, 3.70%, Due 2023 [Member]
Stated interest rate	3.70%
MEC First Mortgage Bonds, 4.80%, Due 2043 [Member]
Stated interest rate	4.80%
Tax-exempt bond obligations, variable rate, due 2016-2038 [Member]
Weighted average interest rate at period end	0.08%	0.18%
Notes, 4.65% Series, due 2014 [Member]
Stated interest rate	4.65%	4.65%
Notes, 5.95% Series, due 2017 [Member]
Stated interest rate	5.95%	5.95%
Notes, 5.3% Series, due 2018 [Member]
Stated interest rate	5.30%	5.30%
Notes, 6.75% Series, due 2031 [Member]
Stated interest rate	6.75%	6.75%
Notes, 5.75% Series, due 2035 [Member]
Stated interest rate	5.75%	5.75%
Notes, 5.8% Series, due 2036 [Member]
Stated interest rate	5.80%	5.80%
Turbine purchase obligation, 1.43%, due 2015 [Member]
Vendor financing, discount rate applied	1.43%	1.43%
Common Stock [Member]
Common Stock, Par or Stated Value Per Share	$ 0.00	$ 0.00
Common Stock, Shares Authorized	350,000,000	350,000,000
Common Stock, Shares, Outstanding	70,980,203	70,980,203
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated other comprehensive income (loss), available-for-sale adjustment, tax	$ (3)	$ (4)
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from cash flow hedges, tax	$ (4)	$ (13)
Preferred Securities [Member]
Preferred Stock, Shares Authorized	100,000,000	100,000,000