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Consolidated Statement of Comprehensive Income - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income | $ 93 | $ 23 | $ 254 | $ 132
Change related to retirement plan Amounts included in net periodic benefit cost for the period |  |  |  |
Amortization of prior service cost | 1 | 0 | 2 | 1
Comprehensive income | 94 | 23 | 256 | 133
Less: Net income attributable to noncontrolling interests, net of tax | 15 | 5 | 42 | 22
Comprehensive income attributable to TDS shareholders | $ 79 | $ 18 | $ 214 | $ 111

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