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Risk Management and Hedging Activities - MEC - Balance Sheet Location (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]        
Derivative, Fair Value, Net $ (77) $ (237)    
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions 74 103    
Derivative Assets (Liabilities), at Fair Value, Net (3) (134)    
Other Current Assets [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Fair Value, Net 48 28    
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions 0 0    
Derivative Assets (Liabilities), at Fair Value, Net 48 28    
Other Current Liabilities [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Fair Value, Net (60) (145)    
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions 13 40    
Derivative Assets (Liabilities), at Fair Value, Net (47) (105)    
Not Designated as Hedging Instrument [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Fair Value, Net (66) (188)    
Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Fair Value, Net 47 28    
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Fair Value, Net (45) (109)    
Designated as Hedging Instrument [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Fair Value, Net (11) (49)    
Designated as Hedging Instrument [Member] | Other Current Assets [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Fair Value, Net 1 0    
Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Fair Value, Net (15) (36)    
Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Fair Value, Net (71) (186)    
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts 148 250 $ 223 $ 182
MidAmerican Energy Company [Member] | Commodity Contract [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Fair Value, Net 4 (72)    
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions 1 28    
Derivative Assets (Liabilities), at Fair Value, Net 5 (44)    
MidAmerican Energy Company [Member] | Commodity Contract [Member] | Other Current Assets [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Fair Value, Net 6 9    
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions 0 0    
Derivative Assets (Liabilities), at Fair Value, Net 6 9    
MidAmerican Energy Company [Member] | Commodity Contract [Member] | Other Noncurrent Assets [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Fair Value, Net 2 4    
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions 0 0    
Derivative Assets (Liabilities), at Fair Value, Net 2 4    
MidAmerican Energy Company [Member] | Commodity Contract [Member] | Other Current Liabilities [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Fair Value, Net (3) (62)    
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions 1 22    
Derivative Assets (Liabilities), at Fair Value, Net (2) (40)    
MidAmerican Energy Company [Member] | Commodity Contract [Member] | Other Noncurrent Liabilities [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Fair Value, Net (1) (23)    
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions 0 6    
Derivative Assets (Liabilities), at Fair Value, Net (1) (17)    
MidAmerican Energy Company [Member] | Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]        
Derivatives, Fair Value [Line Items]        
Derivative Asset, Fair Value, Gross Asset [1] 10 23    
Derivative Liability, Fair Value, Gross Liability [1] (6) (49)    
Derivative, Fair Value, Net [1] 4 (26)    
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts (4) 20 $ 38 $ 10
MidAmerican Energy Company [Member] | Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]        
Derivatives, Fair Value [Line Items]        
Derivative Asset, Fair Value, Gross Asset [1] 8 12    
Derivative Liability, Fair Value, Gross Liability [1] (2) (3)    
Derivative, Fair Value, Net [1] 6 9    
MidAmerican Energy Company [Member] | Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member]        
Derivatives, Fair Value [Line Items]        
Derivative Asset, Fair Value, Gross Asset [1] 2 4    
Derivative Liability, Fair Value, Gross Liability [1] 0 0    
Derivative, Fair Value, Net [1] 2 4    
MidAmerican Energy Company [Member] | Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]        
Derivatives, Fair Value [Line Items]        
Derivative Asset, Fair Value, Gross Asset [1] 0 5    
Derivative Liability, Fair Value, Gross Liability [1] (3) (36)    
Derivative, Fair Value, Net [1] (3) (31)    
MidAmerican Energy Company [Member] | Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]        
Derivatives, Fair Value [Line Items]        
Derivative Asset, Fair Value, Gross Asset [1] 0 2    
Derivative Liability, Fair Value, Gross Liability [1] (1) (10)    
Derivative, Fair Value, Net [1] (1) (8)    
MidAmerican Energy Company [Member] | Commodity Contract [Member] | Designated as Hedging Instrument [Member]        
Derivatives, Fair Value [Line Items]        
Derivative Asset, Fair Value, Gross Asset 0 3    
Derivative Liability, Fair Value, Gross Liability 0 (49)    
Derivative, Fair Value, Net 0 [2] (46)    
MidAmerican Energy Company [Member] | Commodity Contract [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member]        
Derivatives, Fair Value [Line Items]        
Derivative Asset, Fair Value, Gross Asset 0 0    
Derivative Liability, Fair Value, Gross Liability 0 0    
Derivative, Fair Value, Net 0 [2] 0    
MidAmerican Energy Company [Member] | Commodity Contract [Member] | Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member]        
Derivatives, Fair Value [Line Items]        
Derivative Asset, Fair Value, Gross Asset 0 0    
Derivative Liability, Fair Value, Gross Liability 0 0    
Derivative, Fair Value, Net 0 [2] 0    
MidAmerican Energy Company [Member] | Commodity Contract [Member] | Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]        
Derivatives, Fair Value [Line Items]        
Derivative Asset, Fair Value, Gross Asset 0 1    
Derivative Liability, Fair Value, Gross Liability 0 (32)    
Derivative, Fair Value, Net 0 [2] (31)    
MidAmerican Energy Company [Member] | Commodity Contract [Member] | Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]        
Derivatives, Fair Value [Line Items]        
Derivative Asset, Fair Value, Gross Asset 0 2    
Derivative Liability, Fair Value, Gross Liability 0 (17)    
Derivative, Fair Value, Net $ 0 [2] $ (15)    
[1] (1)MidAmerican Energy's commodity derivatives not designated as hedging contracts are generally included in regulated rates. Accordingly, as of December 31, 2016, a net regulatory liability of $4 million was recorded related to the net derivative asset of $4 million, and as of December 31, 2015, a net regulatory asset of $20 million was recorded related to the net derivative liability of $26 million
[2] (2)The changes in derivative values from December 31, 2015, are substantially due to the transfer of MidAmerican Energy's unregulated retail services business to a subsidiary of BHE.