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Investment in Unconsolidated Entities (Tables) | 9 Months Ended
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Sep. 30, 2019
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 carrying value of measurement alternative method investments represents cost minus any impairments plus or minus any observable price changes.
| September 30, 2019 |  | December 31, 2018
(Dollars in millions) |  |  |  |  |
Equity method investments | $ | 490 |  |  | $ | 459 |
Measurement alternative method investments | 21 |  |  | 21 |
Total investments in unconsolidated entities | $ | 511 |  |  | $ | 480 |
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,
| 2019 |  | 2018 |  | 2019 |  | 2018
(Dollars in millions) |  |  |  |  |  |  |  |  |
Revenues | $ | 1,721 |  |  | $ | 1,699 |  |  | $ | 5,077 |  |  | $ | 5,023 |
Operating expenses | 1,247 |  |  | 1,234 |  |  | 3,660 |  |  | 3,651 |
Operating income | 474 |  |  | 465 |  |  | 1,417 |  |  | 1,372 |
Other income (expense), net | (2 | ) |  | (3 | ) |  | (4 | ) |  | (3 | )
Net income | $ | 472 |  |  | $ | 462 |  |  | $ | 1,413 |  |  | $ | 1,369 |

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- Definition The entire disclosure for equity method investments and joint ventures. Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee. Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.3A-04) -URI http://asc.fasb.org/extlink&oid=116822174&loc=d3e355119-122828 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -URI http://asc.fasb.org/topic&trid=2196965 + Details
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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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