Risk Management and Hedging Activities (MEC) Balance Sheet Location (Details) (MidAmerican Energy Company [Member], Commodity Contract [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Total derivative assets (liabilities), net	$ (21)		$ (27)
Cash collateral, net receivable (payable), offset against derivatives	27		0
Total derivatives - net of collateral	6		(27)
Current Assets - Other [Member]
Derivatives, Fair Value [Line Items]
Total derivative assets (liabilities), net	16		2
Cash collateral, net receivable (payable), offset against derivatives	0		(2)
Total derivatives - net of collateral	16		0
Other Assets - Other [Member]
Derivatives, Fair Value [Line Items]
Total derivative assets (liabilities), net	0		2
Cash collateral, net receivable (payable), offset against derivatives	0		0
Total derivatives - net of collateral	0		2
Current Liabilities - Other [Member]
Derivatives, Fair Value [Line Items]
Total derivative assets (liabilities), net	(31)		(20)
Cash collateral, net receivable (payable), offset against derivatives	26		1
Total derivatives - net of collateral	(5)		(19)
Other Liabilities - Other [Member]
Derivatives, Fair Value [Line Items]
Total derivative assets (liabilities), net	(6)		(11)
Cash collateral, net receivable (payable), offset against derivatives	1		1
Total derivatives - net of collateral	(5)		(10)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	34	[1]	23	[1]
Commodity liabilities	(66)	[1]	(40)	[1]
Total derivative assets (liabilities), net	(32)	[1]	(17)	[1]
Net regulatory asset	32		10		24	45
Not Designated as Hedging Instrument [Member] | Current Assets - Other [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	1	[1]	3	[1]
Commodity liabilities	(1)	[1]	(1)	[1]
Total derivative assets (liabilities), net	0	[1]	2	[1]
Not Designated as Hedging Instrument [Member] | Other Assets - Other [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	0	[1]	3	[1]
Commodity liabilities	0	[1]	(1)	[1]
Total derivative assets (liabilities), net	0	[1]	2	[1]
Not Designated as Hedging Instrument [Member] | Current Liabilities - Other [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	32	[1]	16	[1]
Commodity liabilities	(63)	[1]	(32)	[1]
Total derivative assets (liabilities), net	(31)	[1]	(16)	[1]
Not Designated as Hedging Instrument [Member] | Other Liabilities - Other [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	1	[1]	1	[1]
Commodity liabilities	(2)	[1]	(6)	[1]
Total derivative assets (liabilities), net	(1)	[1]	(5)	[1]
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	17		2
Commodity liabilities	(6)		(12)
Total derivative assets (liabilities), net	11		(10)
Designated as Hedging Instrument [Member] | Current Assets - Other [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	17		1
Commodity liabilities	(1)		(1)
Total derivative assets (liabilities), net	16		0
Designated as Hedging Instrument [Member] | Other Assets - Other [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	0		0
Commodity liabilities	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 liabilities	(1)		(5)
Total derivative assets (liabilities), net	0		(4)
Designated as Hedging Instrument [Member] | Other Liabilities - Other [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	(1)		0
Commodity liabilities	(4)		(6)
Total derivative assets (liabilities), net	$ (5)		$ (6)

[1] MidAmerican Energy's commodity derivatives not designated as hedging contracts are generally included in regulated rates, and as of March 31, 2014 and December 31, 2013, a net regulatory asset of $32 million and $10 million, respectively, was recorded related to the net derivative liability of $32 million and $17 million, respectively.