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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 Additional Paid in Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | CVS Health Shareholders' Equity | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | --- | ---
Shares outstanding, balance at beginning of period (in shares) at Dec. 31, 2017 |  |  | 1,712 | (698) | [1] |  |  |  |  |  |
Balance at beginning of period at Dec. 31, 2017 |  | $ 37,695 |  | $ (37,796) | [1] | $ 32,096 | [2] | $ 43,556 | $ (165) | $ 37,691 | $ 4
Shareholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | 998 |  |  |  |  |  | 998 |  | 998 |
Other comprehensive income (loss) |  | 344 |  |  |  |  |  |  | 344 | 344 |
Stock option activity, stock awards and other (in shares) |  |  | 2 |  |  |  |  |  |  |  |
Stock option activity, stock awards and other |  | 112 |  |  |  | 112 | [2] |  |  | 112 |
Purchase of treasury shares, net of ESPP issuances |  | 49 |  | $ 49 | [1] |  |  |  |  | 49 |
Common stock dividends |  | (508) |  |  |  |  |  | (508) |  | (508) |
Shares outstanding, balance at end of period (in shares) at Mar. 31, 2018 |  |  | 1,714 | (698) | [1] |  |  |  |  |  |
Balance at end of period at Mar. 31, 2018 |  | 38,677 |  | $ (37,747) | [1] | 32,208 | [2] | 44,040 | 172 | 38,673 | 4
Shares outstanding, balance at beginning of period (in shares) at Dec. 31, 2017 |  |  | 1,712 | (698) | [1] |  |  |  |  |  |
Balance at beginning of period at Dec. 31, 2017 |  | 37,695 |  | $ (37,796) | [1] | 32,096 | [2] | 43,556 | (165) | 37,691 | 4
Shareholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) |  | 301 |  |  |  |  |  |  |  |  |
Shares outstanding, balance at end of period (in shares) at Sep. 30, 2018 |  |  | 1,717 | (698) | [1] |  |  |  |  |  |
Balance at end of period at Sep. 30, 2018 |  | 36,622 |  | $ (37,731) | [1] | 32,377 | [2] | 41,843 | 129 | 36,618 | 4
Shares outstanding, balance at beginning of period (in shares) at Mar. 31, 2018 |  |  | 1,714 | (698) | [1] |  |  |  |  |  |
Balance at beginning of period at Mar. 31, 2018 |  | 38,677 |  | $ (37,747) | [1] | 32,208 | [2] | 44,040 | 172 | 38,673 | 4
Shareholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | (2,563) |  |  |  |  |  | (2,563) |  | (2,563) |
Other comprehensive income (loss) |  | (31) |  |  |  |  |  |  | (31) | (31) |
Stock option activity, stock awards and other (in shares) |  |  | 2 |  |  |  |  |  |  |  |
Stock option activity, stock awards and other |  | 73 |  |  |  | 73 | [2] |  |  | 73 |
Purchase of treasury shares, net of ESPP issuances (in shares) | [1] |  |  | (1) |  |  |  |  |  |  |
Purchase of treasury shares, net of ESPP issuances |  | (33) |  | $ (33) | [1] |  |  |  |  | (33) |
Common stock dividends |  | (512) |  |  |  |  |  | (512) |  | (512) |
Shares outstanding, balance at end of period (in shares) at Jun. 30, 2018 |  |  | 1,716 | (699) | [1] |  |  |  |  |  |
Balance at end of period at Jun. 30, 2018 |  | 35,611 |  | $ (37,780) | [1] | 32,281 | [2] | 40,965 | 141 | 35,607 | 4
Shareholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | 1,390 |  |  |  |  |  | 1,390 |  | 1,390 |
Other comprehensive income (loss) |  | (12) |  |  |  |  |  |  |  | (12) |
Stock option activity, stock awards and other (in shares) |  |  | 1 |  |  |  |  |  |  |  |
Stock option activity, stock awards and other |  | 96 |  |  |  | 96 | [2] |  |  | 96 |
Purchase of treasury shares, net of ESPP issuances (in shares) | [1] |  |  | 1 |  |  |  |  |  |  |
Purchase of treasury shares, net of ESPP issuances |  | 49 |  | $ 49 | [1] |  |  |  |  | 49 |
Common stock dividends |  | (512) |  |  |  |  |  | (512) |  | (512) |
Shares outstanding, balance at end of period (in shares) at Sep. 30, 2018 |  |  | 1,717 | (698) | [1] |  |  |  |  |  |
Balance at end of period at Sep. 30, 2018 |  | 36,622 |  | $ (37,731) | [1] | 32,377 | [2] | 41,843 | 129 | 36,618 | 4
Shares outstanding, balance at beginning of period (in shares) at Dec. 31, 2018 |  |  | 1,720 | (425) | [3] |  |  |  |  |  |
Balance at beginning of period at Dec. 31, 2018 |  | 58,543 |  | $ (28,228) | [3] | 45,440 | [4] | 40,911 | 102 | 58,225 | 318
Shareholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | 1,427 |  |  |  |  |  | 1,421 |  | 1,421 | 6
Other comprehensive income (loss) |  | 331 |  |  |  |  |  |  | 331 | 331 |
Stock option activity, stock awards and other (in shares) |  |  | 2 |  |  |  |  |  |  |  |
Stock option activity, stock awards and other |  | 175 |  |  |  | 175 | [4] |  |  | 175 |
Purchase of treasury shares, net of ESPP issuances (in shares) | [3] |  |  | 1 |  |  |  |  |  |  |
Purchase of treasury shares, net of ESPP issuances |  | 7 |  | $ 7 | [3] |  |  |  |  | 7 |
Common stock dividends |  | (651) |  |  |  |  |  | (651) |  | (651) |
Other (decreases) increases in noncontrolling interests |  | (4) |  |  |  |  |  |  |  |  | (4)
Shares outstanding, balance at end of period (in shares) at Mar. 31, 2019 |  |  | 1,722 | (424) | [3] |  |  |  |  |  |
Balance at end of period at Mar. 31, 2019 |  | 60,006 |  | $ (28,221) | [3] | 45,615 | [4] | 41,859 | 433 | 59,686 | 320
Shares outstanding, balance at beginning of period (in shares) at Dec. 31, 2018 |  |  | 1,720 | (425) | [3] |  |  |  |  |  |
Balance at beginning of period at Dec. 31, 2018 |  | 58,543 |  | $ (28,228) | [3] | 45,440 | [4] | 40,911 | 102 | 58,225 | 318
Shareholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) |  | 848 |  |  |  |  |  |  |  |  |
Shares outstanding, balance at end of period (in shares) at Sep. 30, 2019 |  |  | 1,725 | (424) | [3] |  |  |  |  |  |
Balance at end of period at Sep. 30, 2019 |  | 62,933 |  | $ (28,207) | [3] | 45,854 | [4] | 44,017 | 950 | 62,614 | 319
Shares outstanding, balance at beginning of period (in shares) at Mar. 31, 2019 |  |  | 1,722 | (424) | [3] |  |  |  |  |  |
Balance at beginning of period at Mar. 31, 2019 |  | 60,006 |  | $ (28,221) | [3] | 45,615 | [4] | 41,859 | 433 | 59,686 | 320
Shareholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | 1,931 |  |  |  |  |  | 1,936 |  | 1,936 | (5)
Other comprehensive income (loss) |  | 251 |  |  |  |  |  |  | 251 | 251 |
Stock option activity, stock awards and other (in shares) |  |  | 2 |  |  |  |  |  |  |  |
Stock option activity, stock awards and other |  | 104 |  |  |  | 104 | [4] |  |  | 104 |
Purchase of treasury shares, net of ESPP issuances (in shares) | [3] |  |  | (1) |  |  |  |  |  |  |
Purchase of treasury shares, net of ESPP issuances |  | (36) |  | $ (36) | [3] |  |  |  |  | (36) |
Common stock dividends |  | (659) |  |  |  |  |  | (659) |  | (659) |
Other (decreases) increases in noncontrolling interests |  | 2 |  |  |  |  |  |  |  |  | 2
Shares outstanding, balance at end of period (in shares) at Jun. 30, 2019 |  |  | 1,724 | (425) | [3] |  |  |  |  |  |
Balance at end of period at Jun. 30, 2019 |  | 61,599 |  | $ (28,257) | [3] | 45,719 | [4] | 43,136 | 684 | 61,282 | 317
Shareholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | 1,529 |  |  |  |  |  | 1,530 |  | 1,530 | (1)
Other comprehensive income (loss) |  | 266 |  |  |  |  |  |  |  | 266 |
Stock option activity, stock awards and other (in shares) |  |  | 1 |  |  |  |  |  |  |  |
Stock option activity, stock awards and other |  | 135 |  |  |  | 135 | [4] |  |  | 135 |
Purchase of treasury shares, net of ESPP issuances (in shares) | [3] |  |  | 1 |  |  |  |  |  |  |
Purchase of treasury shares, net of ESPP issuances |  | 50 |  | $ 50 | [3] |  |  |  |  | 50 |
Common stock dividends |  | (649) |  |  |  |  |  | (649) |  | (649) |
Other (decreases) increases in noncontrolling interests |  | 3 |  |  |  |  |  |  |  |  | 3
Shares outstanding, balance at end of period (in shares) at Sep. 30, 2019 |  |  | 1,725 | (424) | [3] |  |  |  |  |  |
Balance at end of period at Sep. 30, 2019 |  | $ 62,933 |  | $ (28,207) | [3] | $ 45,854 | [4] | $ 44,017 | $ 950 | $ 62,614 | $ 319
[1] | Treasury shares include 1 million shares held in trust as of September 30, 2018, June 30, 2018, March 31, 2018 and December 31, 2017. Treasury stock includes $29 million related to shares held in trust as of September 30, 2018 and $31 million related to shares held in trust as of June 30, 2018, March 31, 2018 and December 31, 2017.
[2] | Common stock and capital surplus includes the par value of common stock of $17 million as of September 30, 2018, June 30, 2018, March 31, 2018 and December 31, 2017.
[3] | Treasury shares includes 1 million shares held in trust and treasury stock includes $29 million related to shares held in trust as of September 30, 2019, June 30, 2019, March 31, 2019 and December 31, 2018.
[4] | Common stock and capital surplus includes the par value of common stock of $17 million as of September 30, 2019, June 30, 2019, March 31, 2019 and December 31, 2018.

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