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Consolidated Statements of Shareholders' Equity - USD ($) shares in Millions, $ in Millions | Total | Common Shares | Treasury Shares | Common Stock and Capital Surplus | [2] | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | CVS Health Shareholders' Equity | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period (in shares) at Dec. 31, 2015 |  |  | 1,699 | (598) | [1] |  |  |  |  |
Balance at beginning of period at Dec. 31, 2015 |  | $ 37,203 |  | $ (28,917) | [1] | $ 30,965 | $ 35,506 | $ (358) | $ 37,196 | $ 7
Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income | [3] | 5,318 |  |  |  |  | 5,317 |  | 5,317 | 1
Net income (loss) |  | 5,319 |  |  |  |  |  |  |  |
Other comprehensive income (loss) |  | 53 |  |  |  |  |  | 53 | 53 |
Stock option activity, stock awards, related tax benefits and other (in shares) |  |  | 6 |  |  |  |  |  |  |
Stock option activity, stock awards, related tax benefits and other |  | 525 |  |  |  | 525 |  |  | 525 |
Purchase of treasury shares, net of ESPP issuances (in shares) | [1] |  |  | (46) |  |  |  |  |  |
Purchase of treasury shares, net of ESPP issuances |  | (4,421) |  | $ (4,566) | [1] | 145 |  |  | (4,421) |
Common stock dividends |  | (1,840) |  |  |  |  | (1,840) |  | (1,840) |
Other decreases in noncontrolling interests |  | (4) |  |  |  |  |  |  |  | (4)
Balance at end of period (in shares) at Dec. 31, 2016 |  |  | 1,705 | (644) | [1] |  |  |  |  |
Balance at end of period at Dec. 31, 2016 |  | 36,834 |  | $ (33,483) | [1] | 31,635 | 38,983 | (305) | 36,830 | 4
Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | 6,623 |  |  |  |  | 6,622 |  | 6,622 | 1
Other comprehensive income (loss) |  | 140 |  |  |  |  |  | 140 | 140 |
Stock option activity, stock awards, related tax benefits and other (in shares) |  |  | 7 |  |  |  |  |  |  |
Stock option activity, stock awards, related tax benefits and other |  | 461 |  |  |  | 461 |  |  | 461 |
Purchase of treasury shares, net of ESPP issuances (in shares) | [1] |  |  | (54) |  |  |  |  |  |
Purchase of treasury shares, net of ESPP issuances |  | (4,313) |  | $ (4,313) | [1] |  |  |  | (4,313) |
Common stock dividends |  | (2,049) |  |  |  |  | (2,049) |  | (2,049) |
Other decreases in noncontrolling interests |  | (1) |  |  |  |  |  |  |  | (1)
Balance at end of period (in shares) at Dec. 31, 2017 |  |  | 1,712 | (698) | [1] |  |  |  |  |
Balance at end of period at Dec. 31, 2017 |  | 37,695 |  | $ (37,796) | [1] | 32,096 | 43,556 | (165) | 37,691 | 4
Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | (596) |  |  |  |  | (594) |  | (594) | (2)
Other comprehensive income (loss) |  | 274 |  |  |  |  |  | 274 | 274 |
Common shares issued to acquire Aetna (in shares) | [1] |  |  | 274 |  |  |  |  |  |
Common shares issued to acquire Aetna |  | 22,484 |  | $ 9,561 | [1] | 12,923 |  |  | 22,484 |
Stock option activity, stock awards, related tax benefits and other (in shares) |  |  | 8 |  |  |  |  |  |  |
Stock option activity, stock awards, related tax benefits and other |  | 421 |  |  |  | 421 |  |  | 421 |
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 |  | (2,045) |  |  |  |  | (2,045) |  | (2,045) |
Other decreases in noncontrolling interests |  | (13) |  |  |  |  |  |  |  | (13)
Acquisition of noncontrolling interests |  | 329 |  |  |  |  |  |  |  | 329
Balance at end of period (in shares) at Dec. 31, 2018 |  |  | 1,720 | (425) | [1] |  |  |  |  |
Balance at end of period at Dec. 31, 2018 |  | 58,543 |  | $ (28,228) | [1] | $ 45,440 | 40,911 | 102 | 58,225 | $ 318
Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Adoption of new accounting standards (Note 1) |  | $ (13) |  |  |  |  | $ (6) | $ (7) | $ (13) |
[1] | Treasury shares include 1 million shares held in trust for each of the years ended December 31, 2018, 2017 and 2016. Treasury stock includes $29 million related to shares held in trust for the year ended December 31, 2018 and $31 million related to shares held in trust for each of the years ended December 31, 2017 and 2016. See Note 1 ‘‘Significant Accounting Policies’’ for additional information.
[2] | Common stock and capital surplus includes the par value of common stock of $17 million as of December 31, 2018, 2017 and 2016.
[3] | Net income attributable to noncontrolling interests for the year ended December 31, 2016 excludes $1 million attributable to a redeemable noncontrolling interest. See Note 1 ‘‘Significant Accounting Policies’’ for additional information.

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