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Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) shares in Millions, $ in Millions | Total | Common Stock | Treasury Stock | Common Stock Including Capital Surplus | [2] | Retained Earnings | Accumulated Other Comprehensive Income | Total CVS Health Shareholders’ Equity | Noncontrolling Interests
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Shares outstanding, balance at beginning of period (in shares) at Dec. 31, 2018 |  |  | 1,720 | (425) | [1] |  |  |  |  |
Balance at beginning of period at Dec. 31, 2018 |  | $ 58,543 |  | $ (28,228) | [1] | $ 45,440 | $ 40,911 | $ 102 | $ 58,225 | $ 318
Shareholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income |  | 1,427 |  |  |  |  | 1,421 |  | 1,421 | 6
Other comprehensive loss (Note 7) |  | 331 |  |  |  |  |  | 331 | 331 |
Stock option activity, stock awards and other (in shares) |  |  | 2 |  |  |  |  |  |  |
Stock option activity, stock awards and other |  | 175 |  |  |  | 175 |  |  | 175 |
Purchase of treasury shares, net of ESPP issuances (in shares) | [1] |  |  | 1 |  |  |  |  |  |
Purchase of treasury shares, net of ESPP issuances |  | 7 |  | $ 7 | [1] |  |  |  | 7 |
Common stock dividends |  | (651) |  |  |  |  | (651) |  | (651) |
Other increases in noncontrolling interests |  | (4) |  |  |  |  |  |  |  | (4)
Shares outstanding, balance at end of period (in shares) at Mar. 31, 2019 |  |  | 1,722 | (424) | [1] |  |  |  |  |
Balance at end of period at Mar. 31, 2019 |  | 60,006 |  | $ (28,221) | [1] | 45,615 | 41,859 | 433 | 59,686 | 320
Shares outstanding, balance at beginning of period (in shares) at Dec. 31, 2019 |  |  | 1,727 | (425) | [1] |  |  |  |  |
Balance at beginning of period at Dec. 31, 2019 |  | 64,170 |  | $ (28,235) | [1] | 45,972 | 45,108 | 1,019 | 63,864 | 306
Shareholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income |  | 2,012 |  |  |  |  | 2,007 |  | 2,007 | 5
Other comprehensive loss (Note 7) |  | (332) |  |  |  |  |  | (332) | (332) |
Stock option activity, stock awards and other (in shares) |  |  | 2 |  |  |  |  |  |  |
Stock option activity, stock awards and other |  | 208 |  |  |  | 208 |  |  | 208 |
Purchase of treasury shares, net of ESPP issuances (in shares) | [1] |  |  | 1 |  |  |  |  |  |
Purchase of treasury shares, net of ESPP issuances |  | 53 |  | $ 53 | [1] |  |  |  | 53 |
Common stock dividends |  | (657) |  |  |  |  | (657) |  | (657) |
Other increases in noncontrolling interests |  | 23 |  |  |  |  |  |  |  | 23
Shares outstanding, balance at end of period (in shares) at Mar. 31, 2020 |  |  | 1,729 | (424) | [1] |  |  |  |  |
Balance at end of period at Mar. 31, 2020 |  | $ 65,474 |  | $ (28,182) | [1] | $ 46,180 | $ 46,455 | $ 687 | $ 65,140 | $ 334
[1] | Treasury shares include 1 million shares held in trust and treasury stock includes $29 million related to shares held in trust as of March 31, 2020 and 2019 and December 31, 2019 and 2018.
[2] | Common stock and capital surplus includes the par value of common stock of $17 million as of March 31, 2020 and 2019 and December 31, 2019 and 2018.

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