Income Taxes (LLC) (Tables) (MidAmerican Funding, LLC and Subsidiaries [Domain])

12 Months Ended

Dec. 31, 2012

MidAmerican Funding, LLC and Subsidiaries [Domain]

Income Tax Disclosure [Line Items]

Components of Income Tax Expense (Benefit) [Table Text Block]

MidAmerican Funding's income tax (benefit) expense consists of the following for the years ended December 31 (in millions):

	2012			2011			2010
Current:
Federal	$	(260	)	$	(480	)	$	(172	)
State	(23		)	(8		)	(31		)
	(283		)	(488		)	(203		)
Deferred:
Federal	198			452			130
State	(21		)	11			14
	177			463			144
Investment tax credits	(2		)	(1		)	(2		)
Total	$	(108	)	$	(26	)	$	(61	)

Effective Income Tax Rate Reconciliation [Table Text Block]

A reconciliation of the federal statutory income tax rate to the effective income tax rate applicable to income before income tax expense is as follows for the years ended December 31:

	2012		2011		2010
Federal statutory income tax rate	35	%	35	%	35	%
Income tax credits	(60	)	(34	)	(30	)
State income tax, net of federal income tax benefit	(12	)	(1	)	(4	)
Income tax method changes	(6	)	(11	)	(19	)
Effects of ratemaking	(1	)	—		(3	)
Other, net	(2	)	2		(1	)
Effective federal and state income tax rate	(46	)%	(9	)%	(22	)%

Components of Net Deferred Income Tax Liability [Table Text Block]

MidAmerican Funding's net deferred income tax liability consists of the following as of December 31 (in millions):

	2012			2011
Deferred income tax assets:
Regulatory liabilities	$	311		$	300
Employee benefits	83			96
Derivative contracts	32			48
Asset retirement obligations	132			122
Other	88			68
Total deferred income tax assets	646			634
Deferred income tax liabilities:
Depreciable property	(2,432		)	(2,195		)
Regulatory assets	(353		)	(333		)
Other	(26		)	(19		)
Total deferred income tax liabilities	(2,811		)	(2,547		)
Net deferred income tax liability	$	(2,165	)	$	(1,913	)
Reflected as:
Current assets - other	$	—		$	5
Current liabilities - other	(3		)	—
Deferred income taxes	(2,162		)	(1,918		)
	$	(2,165	)	$	(1,913	)

Net Unrecognized Tax Benefits Roll Forward [Table Text Block]

A reconciliation of the beginning and ending balances of MidAmerican Funding's net unrecognized tax benefits is as follows for the years ended December 31 (in millions):

	2012			2011
Beginning balance	$	47		$	80
Additions based on tax positions related to the current year	10			8
Additions for tax positions of prior years	25			4
Reductions based on tax positions related to the current year	(16		)	(2		)
Reductions for tax positions of prior years	(22		)	(41		)
Statute of limitations	(4		)	(1		)
Settlements	(2		)	—
Interest and penalties	(1		)	(1		)
Ending balance	$	37		$	47