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Noncontrolling Interests (Notes)
 12 Months Ended
Dec. 31, 2017
Noncontrolling Interest [Line Items]  
Noncontrolling Interests [Text Block]
Noncontrolling Interests

Included in noncontrolling interests on the Consolidated Balance Sheets are preferred securities of subsidiaries of $58 million as of December 31, 2017 and 2016, consisting of $56 million of 8.061% cumulative preferred securities of Northern Electric plc., a subsidiary of Northern Powergrid, which are redeemable in the event of the revocation of Northern Electric plc.'s electricity distribution license by the Secretary of State, and $2 million of nonredeemable preferred stock of PacifiCorp.
MidAmerican Funding, LLC and Subsidiaries [Domain]  
Noncontrolling Interest [Line Items]  
Other, Net [Text Block]
Other Income and (Expense) - Other, Net

Other, net, as shown on the Consolidated Statements of Operations, includes the following other income (expense) items for the years ended December 31 (in millions):
 
2017
 
2016
 
2015
 
 
 
 
 
 
Corporate-owned life insurance income
$
13

 
$
8

 
$
4

Gain on redemption of auction rate securities
—

 
5

 
—

Gains on sales of assets and other investments
1

 
3

 
13

Loss on debt tender offer
(29
)
 
—

 
—

Interest income and other, net
6

 
3

 
2

Total
$
(9
)
 
$
19

 
$
19


Refer to Note 9 for information regarding the debt tender offer. MidAmerican Funding recognized a $13 million pre-tax gain on the sale of an investment in a generating facility lease in 2015.