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Investment in Unconsolidated Entities (Tables)
9 Months Ended
Sep. 30, 2018
Equity Method Investments and Joint Ventures [Abstract]  
Equity and measurement alternative method investments
TDS’ Investments in unconsolidated entities are accounted for using either the equity method or measurement alternative method as shown in the table below.  The measurement alternative method was elected for investments without readily determinable fair values formerly accounted for under the cost method.  The measurement alternative fair value represents cost minus any impairments plus or minus any observable price changes.  TDS did not have an impairment or observable price change related to these investments for the three and nine months ended September 30, 2018.
 
September 30, 2018
 
December 31, 2017
(Dollars in millions)
 

 
 

Equity method investments
$
481

 
$
435

Measurement alternative method investments
19

 
18

Total investments in unconsolidated entities
$
500

 
$
453

Equity method investments, summarized results of operations
The following table, which is based in part on information provided by third parties, summarizes the combined results of operations of TDS’ equity method investments.
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
(Dollars in millions)
 

 
 

 
 
 
 
Revenues
$
1,699

 
$
1,596

 
$
5,023

 
$
4,848

Operating expenses
1,234

 
1,184

 
3,651

 
3,631

Operating income
465

 
412

 
1,372

 
1,217

Other income (expense), net
(3
)
 
(2
)
 
(3
)
 
(4
)
Net income
$
462

 
$
410

 
$
1,369

 
$
1,213