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Consolidated Statement of Comprehensive Income - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Statement of Comprehensive Income [Abstract] |  |  |  |  |  |
Net income (loss) | $ 53 | [1] | $ (231) | $ 155 | [1] | $ (176)
Change related to retirement plan Amounts included in net periodic benefit cost for the period |  |  |  |  |  |
Amortization of prior service cost | 0 |  | 0 | (1) |  | (1)
Comprehensive income (loss) | 53 |  | (231) | 154 |  | (177)
Less: Net income (loss) attributable to noncontrolling interests, net of tax | 7 |  | (50) | 36 |  | (42)
Comprehensive income (loss) attributable to TDS shareholders | $ 46 |  | $ (181) | $ 118 |  | $ (135)
[1] | As of January 1, 2018, TDS adopted ASU 2014-09 using a modified retrospective approach. Under this method, the new accounting standard is applied only to the most recent period presented. As a result, 2018 amounts include the impacts of ASU 2014-09, but 2017 amounts remain as previously reported, except as specifically stated. See Note 2 — Revenue Recognition for additional information.

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