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Fair Value Measurements (MEC) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Equity Funds [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure   $ 1
Equity Funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure   1
Equity Funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure   0
Equity Funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure   0
Equity Funds [Member] | Fair Value, Measurements, Recurring [Member] | Collateral and netting [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure   0
MidAmerican Energy Company [Member] | Collateral and netting [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions 8 7
MidAmerican Energy Company [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Commodity derivative assets 6 7
Assets, Fair Value Disclosure 481 528
Liabilities - commodity derivatives, fair value (24) (77)
MidAmerican Energy Company [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Commodity derivative assets 3 1
Assets, Fair Value Disclosure 415 458
Liabilities - commodity derivatives, fair value (4) (10)
MidAmerican Energy Company [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Commodity derivative assets 32 22
Assets, Fair Value Disclosure 73 65
Liabilities - commodity derivatives, fair value (55) (90)
MidAmerican Energy Company [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Commodity derivative assets 4 7
Assets, Fair Value Disclosure 26 28
Liabilities - commodity derivatives, fair value (6) (7)
MidAmerican Energy Company [Member] | Fair Value, Measurements, Recurring [Member] | Collateral and netting [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Commodity derivative assets (33) [1] (23) [1]
Assets, Fair Value Disclosure (33) [1] (23) [1]
Liabilities - commodity derivatives, fair value 41 [1] 30 [1]
MidAmerican Energy Company [Member] | Money market mutual funds [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 96 [2] 163 [2]
MidAmerican Energy Company [Member] | Money market mutual funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 96 [2] 163 [2]
MidAmerican Energy Company [Member] | Money market mutual funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 0 [2] 0 [2]
MidAmerican Energy Company [Member] | Money market mutual funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 0 [2] 0 [2]
MidAmerican Energy Company [Member] | Money market mutual funds [Member] | Fair Value, Measurements, Recurring [Member] | Collateral and netting [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 0 [1],[2] 0 [1],[2]
MidAmerican Energy Company [Member] | United States government obligations [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 116 104
MidAmerican Energy Company [Member] | United States government obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 116 104
MidAmerican Energy Company [Member] | United States government obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 0 0
MidAmerican Energy Company [Member] | United States government obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 0 0
MidAmerican Energy Company [Member] | United States government obligations [Member] | Fair Value, Measurements, Recurring [Member] | Collateral and netting [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 0 [1] 0 [1]
MidAmerican Energy Company [Member] | International government obligations [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 1 1
MidAmerican Energy Company [Member] | International government obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 0 0
MidAmerican Energy Company [Member] | International government obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 1 1
MidAmerican Energy Company [Member] | International government obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 0 0
MidAmerican Energy Company [Member] | International government obligations [Member] | Fair Value, Measurements, Recurring [Member] | Collateral and netting [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 0 [1] 0 [1]
MidAmerican Energy Company [Member] | Corporate obligations [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 34 32
MidAmerican Energy Company [Member] | Corporate obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 0 0
MidAmerican Energy Company [Member] | Corporate obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 34 32
MidAmerican Energy Company [Member] | Corporate obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 0 0
MidAmerican Energy Company [Member] | Corporate obligations [Member] | Fair Value, Measurements, Recurring [Member] | Collateral and netting [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 0 [1] 0 [1]
MidAmerican Energy Company [Member] | Municipal obligations [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 4 4
MidAmerican Energy Company [Member] | Municipal obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 0 0
MidAmerican Energy Company [Member] | Municipal obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 4 4
MidAmerican Energy Company [Member] | Municipal obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 0 0
MidAmerican Energy Company [Member] | Municipal obligations [Member] | Fair Value, Measurements, Recurring [Member] | Collateral and netting [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 0 [1] 0 [1]
MidAmerican Energy Company [Member] | Agency, asset and mortgage-backed obligations [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 2 6
MidAmerican Energy Company [Member] | Agency, asset and mortgage-backed obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 0 0
MidAmerican Energy Company [Member] | Agency, asset and mortgage-backed obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 2 6
MidAmerican Energy Company [Member] | Agency, asset and mortgage-backed obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 0 0
MidAmerican Energy Company [Member] | Agency, asset and mortgage-backed obligations [Member] | Fair Value, Measurements, Recurring [Member] | Collateral and netting [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 0 [1] 0 [1]
MidAmerican Energy Company [Member] | Auction rate securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 22 21
MidAmerican Energy Company [Member] | Auction rate securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 0 0
MidAmerican Energy Company [Member] | Auction rate securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 0 0
MidAmerican Energy Company [Member] | Auction rate securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 22 21
MidAmerican Energy Company [Member] | Auction rate securities [Member] | Fair Value, Measurements, Recurring [Member] | Collateral and netting [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 0 [1] 0 [1]
MidAmerican Energy Company [Member] | United States equity securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 197 187
MidAmerican Energy Company [Member] | United States equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 197 187
MidAmerican Energy Company [Member] | United States equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 0 0
MidAmerican Energy Company [Member] | United States equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 0 0
MidAmerican Energy Company [Member] | United States equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Collateral and netting [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 0 [1] 0 [1]
MidAmerican Energy Company [Member] | International equity securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 3 2
MidAmerican Energy Company [Member] | International equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 3 2
MidAmerican Energy Company [Member] | International equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 0 0
MidAmerican Energy Company [Member] | International equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 0 0
MidAmerican Energy Company [Member] | International equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Collateral and netting [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities, Fair Value Disclosure $ 0 [1] $ 0 [1]
[1] Represents netting under master netting arrangements and a net cash collateral receivable of $8 million and $7 million as of March 31, 2013 and December 31, 2012, respectively.
[2] Amounts are included in cash and cash equivalents and investments and nonregulated property, net on the Balance Sheets. The fair value of these money market mutual funds approximates cost.