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CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Millions | Total | Cumulative Effect, Period of Adoption, Adjustment | Common Stock | Treasury Stock | Additional Paid-In Capital | Retained Deficit | Retained Deficit Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjustment | Stockholders' Equity Attributable to Parent | Stockholders' Equity Attributable to Parent Cumulative Effect, Period of Adoption, Adjustment | Non- controlling Interest
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 | $ 14,181 | $ (18) | $ 508 | $ (574) | $ 10,362 | $ 4,611 | $ 45 | $ (763) | $ (63) | $ 14,144 | $ (18) | $ 37
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income (loss) | (7,029) |  |  |  |  | (6,942) |  | (83) |  | (7,025) |  | (4)
Dividends declared on common stock | (436) |  |  |  | (211) | (225) |  |  |  | (436) |  |
Equity compensation, net of tax | 64 |  | 1 | (11) | 74 |  |  |  |  | 64 |  |
Common stock purchased and retired | (1,507) |  | (63) |  | (1,444) |  |  |  |  | (1,507) |  |
Portion of net income (loss) attributable to noncontrolling interests | (2) |  |  |  |  |  |  | (4) |  | (4) |  | 2
Ending balance at Dec. 31, 2018 | 5,253 |  | 446 | (585) | 8,781 | (2,511) |  | (913) |  | 5,218 |  | 35
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income (loss) | 100 |  |  |  |  | 107 |  | (6) |  | 101 |  | (1)
Dividends declared on common stock | (393) |  |  |  | (393) |  |  |  |  | (393) |  |
Equity compensation, net of tax | 38 |  | 1 | (5) | 42 |  |  |  |  | 38 |  |
Portion of net income (loss) attributable to noncontrolling interests | 1 |  |  |  |  |  |  | (1) |  | (1) |  | 2
Distributions to noncontrolling interests | (3) |  |  |  |  |  |  |  |  |  |  | (3)
Ending balance at Dec. 31, 2019 | 4,996 |  | 447 | (590) | 8,430 | (2,404) |  | (920) |  | 4,963 |  | 33
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income (loss) | (730) |  |  |  |  | (770) |  | 45 |  | (725) |  | (5)
Dividends declared on common stock | (392) |  |  |  | (392) |  |  |  |  | (392) |  |
Equity compensation, net of tax | 33 |  | 1 | (8) | 40 |  |  |  |  | 33 |  |
Portion of net income (loss) attributable to noncontrolling interests | (4) |  |  |  |  |  |  | (5) |  | (5) |  | 1
Distributions to noncontrolling interests | (3) |  |  |  |  |  |  |  |  |  |  | (3)
Ending balance at Dec. 31, 2020 | $ 3,900 |  | $ 448 | $ (598) | $ 8,078 | $ (3,174) |  | $ (880) |  | $ 3,874 |  | $ 26

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