Risk Management and Hedging Activities (MEC) Balance Sheet Location (Details) (MidAmerican Energy Company [Member], Commodity Contract [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Derivatives, Fair Value [Line Items]
Total derivative, assets (liabilities), net	$ (27)		$ (77)
Cash collateral, net receivable (payable), offset against derivative positions	0		7
Total derivative, net of collateral	(27)		(70)
Current Assets - Other [Member]
Derivatives, Fair Value [Line Items]
Total derivative, assets (liabilities), net	2		6
Cash collateral, net receivable (payable), offset against derivative positions	(2)		0
Total derivative, net of collateral	0		6
Other Assets - Other [Member]
Derivatives, Fair Value [Line Items]
Total derivative, assets (liabilities), net	2		1
Cash collateral, net receivable (payable), offset against derivative positions	0		0
Total derivative, net of collateral	2		1
Current Liabilities - Other [Member]
Derivatives, Fair Value [Line Items]
Total derivative, assets (liabilities), net	(20)		(61)
Cash collateral, net receivable (payable), offset against derivative positions	1		6
Total derivative, net of collateral	(19)		(55)
Other Liabilities - Other [Member]
Derivatives, Fair Value [Line Items]
Total derivative, assets (liabilities), net	(11)		(23)
Cash collateral, net receivable (payable), offset against derivative positions	1		1
Total derivative, net of collateral	(10)		(22)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	23	[1]	28	[1]
Commodity liability	(40)	[1]	(73)	[1]
Total derivative, assets (liabilities), net	(17)	[1]	(45)	[1]
Net regulatory asset	10		45		73	27
Not Designated as Hedging Instrument [Member] | Current Assets - Other [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	3	[1]	18	[1]
Commodity liability	(1)	[1]	(12)	[1]
Total derivative, assets (liabilities), net	2	[1]	6	[1]
Not Designated as Hedging Instrument [Member] | Other Assets - Other [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	3	[1]	1	[1]
Commodity liability	(1)	[1]	0	[1]
Total derivative, assets (liabilities), net	2	[1]	1	[1]
Not Designated as Hedging Instrument [Member] | Current Liabilities - Other [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	16	[1]	7	[1]
Commodity liability	(32)	[1]	(47)	[1]
Total derivative, assets (liabilities), net	(16)	[1]	(40)	[1]
Not Designated as Hedging Instrument [Member] | Other Liabilities - Other [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	1	[1]	2	[1]
Commodity liability	(6)	[1]	(14)	[1]
Total derivative, assets (liabilities), net	(5)	[1]	(12)	[1]
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	2		2
Commodity liability	(12)		(34)
Total derivative, assets (liabilities), net	(10)		(32)
Designated as Hedging Instrument [Member] | Current Assets - Other [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	1		0
Commodity liability	(1)		0
Total derivative, assets (liabilities), net	0		0
Designated as Hedging Instrument [Member] | Other Assets - Other [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	0		0
Commodity liability	0		0
Total derivative, assets (liabilities), net	0		0
Designated as Hedging Instrument [Member] | Current Liabilities - Other [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	1		1
Commodity liability	(5)		(22)
Total derivative, assets (liabilities), net	(4)		(21)
Designated as Hedging Instrument [Member] | Other Liabilities - Other [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	0		1
Commodity liability	(6)		(12)
Total derivative, assets (liabilities), net	$ (6)		$ (11)

[1] MidAmerican Energy's commodity derivatives not designated as hedging contracts are generally included in regulated rates. Accordingly, as of December 31, 2013 and 2012, a net regulatory asset of $10 million and $45 million, respectively, was recorded related to the net derivative liability of $17 million and $45 million, respectively.