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Unaudited Quarterly Operating Results (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])
12 Months Ended
Dec. 31, 2012
MidAmerican Funding, LLC and Subsidiaries [Domain]
 
Unaudited Quarterly Operating Results [Line Items]  
Unaudited Quarterly Financial Information [Text Block]
(20)
Unaudited Quarterly Operating Results

 
2012
 
1st Quarter
 
2nd Quarter
 
3rd Quarter
 
4th Quarter
 
(In millions)
Operating revenue
$
874

 
$
709

 
$
828

 
$
836

Operating income
91

 
81

 
139

 
58

Net income
71

 
78

 
136

 
58

Net income attributable to MidAmerican Funding
71

 
77

 
136

 
58


 
2011
 
1st Quarter
 
2nd Quarter
 
3rd Quarter
 
4th Quarter
 
(In millions)
Operating revenue
$
979

 
$
805

 
$
866

 
$
853

Operating income
113

 
85

 
148

 
82

Net income
69

 
45

 
104

 
87

Net income attributable to MidAmerican Funding
69

 
44

 
104

 
87


Quarterly data reflect seasonal variations common to a Midwest utility. Net income for the second quarter of 2012 and the fourth quarter of 2011 reflects $18 million and $35 million, respectively, of income tax benefits recognized for changes in the tax accounting methods used to determine current income tax deductions. Refer to Note 10 for further discussion regarding MidAmerican Energy's changes in tax accounting methods.