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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
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2016 | $ 3,645 | $ 88 | $ 1,522 | $ (136) | $ 2,160 | $ 3,634 | $ 11
Net income attributable to U.S. Cellular shareholders | 26 |  |  |  | 26 | 26 |
Net income attributable to noncontrolling interests classified as equity | 1 |  |  |  |  |  | 1
Incentive and compensation plans | 3 |  |  | 4 | (1) | 3 |
Stock-based compensation awards | 7 |  | 7 |  |  | 7 |
Ending balance at Mar. 31, 2017 | 3,682 | 88 | 1,529 | (132) | 2,185 | 3,670 | 12
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
Cumulative effect of accounting change | $ 176 |  |  |  | $ 175 | $ 175 | $ 1

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