Consolidated Statements of Capitalization (LLC) Consolidated Statements of Capitalization (LLC) (Parenthetical) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
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
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 2.40%, Due 2019 [Member]
Stated interest rate	2.40%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.70%, Due 2023 [Member]
Stated interest rate	3.70%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 4.80%, Due 2043 [Member]
Stated interest rate	4.80%
MidAmerican Energy Company [Member] | Tax-exempt bond obligations, variable rate, due 2016-2038 [Member]
Weighted average interest rate at period end	0.08%	0.18%
MidAmerican Energy Company [Member] | Notes, 4.65% Series, due 2014 [Member]
Stated interest rate	4.65%	4.65%
MidAmerican Energy Company [Member] | Notes, 5.95% Series, due 2017 [Member]
Stated interest rate	5.95%	5.95%
MidAmerican Energy Company [Member] | Notes, 5.3% Series, due 2018 [Member]
Stated interest rate	5.30%	5.30%
MidAmerican Energy Company [Member] | Notes, 6.75% Series, due 2031 [Member]
Stated interest rate	6.75%	6.75%
MidAmerican Energy Company [Member] | Notes, 5.75% Series, due 2035 [Member]
Stated interest rate	5.75%	5.75%
MidAmerican Energy Company [Member] | Notes, 5.8% Series, due 2036 [Member]
Stated interest rate	5.80%	5.80%
MidAmerican Energy Company [Member] | Turbine purchase obligation, 1.43%, due 2015 [Member]
Vendor financing, discount rate applied	1.43%	1.43%
MidAmerican Funding LLC [Member] | MidAmerican Funding senior secured notes, 6.927%, due 2029 [Member]
Stated interest rate	6.927%	6.927%