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Consolidated Statement of Changes in Equity - USD ($) $ in Millions | Total | Series A Common and Common shares | Additional paid-in capital | Treasury shares | Retained earnings | Total U.S. Cellular shareholders' equity | Noncontrolling interests
--- | --- | --- | --- | --- | --- | --- | ---
Cumulative effect of accounting change | $ 176 |  |  |  | $ 175 | $ 175 | $ 1
Beginning balance at Dec. 31, 2017 | 3,687 | $ 88 | $ 1,552 | $ (120) | 2,157 | 3,677 | 10
Net income attributable to U.S. Cellular shareholders | 45 |  |  |  | 45 | 45 |
Incentive and compensation plans | 2 |  |  | 4 | (2) | 2 |
Stock-based compensation awards | 8 |  | 8 |  |  | 8 |
Ending balance at Mar. 31, 2018 | 3,918 | 88 | 1,560 | (116) | 2,375 | 3,907 | 11
Beginning balance at Dec. 31, 2018 | 4,067 | 88 | 1,590 | (65) | 2,444 | 4,057 | 10
Net income attributable to U.S. Cellular shareholders | 54 |  |  |  | 54 | 54 |
Net income attributable to noncontrolling interests classified as equity | 4 |  |  |  |  | 0 | 4
Incentive and compensation plans | 1 |  |  | 2 | (1) | 1 |
Stock-based compensation awards | 9 |  | 9 |  |  | 9 |
Distributions to noncontrolling interests | (1) |  |  |  |  | 0 | (1)
Ending balance at Mar. 31, 2019 | $ 4,134 | $ 88 | $ 1,599 | $ (63) | $ 2,497 | $ 4,121 | $ 13

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