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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 | Retained Earnings | Accumulated Other Comprehensive Income | Total CVS Health Shareholders’ Equity | Noncontrolling Interests | Cumulative Effect, Period of Adoption, Adjustment | Cumulative Effect, Period of Adoption, Adjustment Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment Total CVS Health Shareholders’ Equity
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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 | [2] | $ 40,911 | $ 102 | $ 58,225 | $ 318 | $ 178 | [3] | $ 178 | [3] | $ 178 | [3]
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 | [2] |  |  | 175 |  |  |  |  |  |  |
ESPP issuances, net of purchase of treasury shares (in shares) | [1] |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
ESPP issuances, net of purchase of treasury shares |  | 7 |  | $ 7 | [1] |  |  |  |  | 7 |  |  |  |  |  |  |
Common stock dividends |  | (651) |  |  |  |  |  | (651) |  | (651) |  |  |  |  |  |  |
Other increases (decreases) 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 | [2] | 41,859 | 433 | 59,686 | 320 |  |  |  |  |  |
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 | [2] | 40,911 | 102 | 58,225 | 318 | 178 | [3] | 178 | [3] | 178 | [3]
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) | [1] |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of period at Sep. 30, 2019 |  | 62,933 |  | $ (28,207) | [1] | 45,854 | [2] | 44,017 | 950 | 62,614 | 319 |  |  |  |  |  |
Shares outstanding, balance at beginning of period (in shares) at Mar. 31, 2019 |  |  | 1,722 | (424) | [1] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period at Mar. 31, 2019 |  | 60,006 |  | $ (28,221) | [1] | 45,615 | [2] | 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 | [2] |  |  | 104 |  |  |  |  |  |  |
Purchases of treasury shares, net of ESPP issuances (in shares) | [1] |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of treasury shares, net of ESPP issuances |  | (36) |  | $ (36) | [1] |  |  |  |  | (36) |  |  |  |  |  |  |
Common stock dividends |  | (659) |  |  |  |  |  | (659) |  | (659) |  |  |  |  |  |  |
Other increases (decreases) in noncontrolling interests |  | 2 |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Shares outstanding, balance at end of period (in shares) at Jun. 30, 2019 |  |  | 1,724 | (425) | [1] |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of period at Jun. 30, 2019 |  | 61,599 |  | $ (28,257) | [1] | 45,719 | [2] | 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 | 266 |  |  |  |  |  |  |
Stock option activity, stock awards and other (in shares) |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option activity, stock awards and other |  | 135 |  |  |  | 135 | [2] |  |  | 135 |  |  |  |  |  |  |
ESPP issuances, net of purchase of treasury shares (in shares) | [1] |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
ESPP issuances, net of purchase of treasury shares |  | 50 |  | $ 50 | [1] |  |  |  |  | 50 |  |  |  |  |  |  |
Common stock dividends |  | (649) |  |  |  |  |  | (649) |  | (649) |  |  |  |  |  |  |
Other increases (decreases) in noncontrolling interests |  | 3 |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |
Shares outstanding, balance at end of period (in shares) at Sep. 30, 2019 |  |  | 1,725 | (424) | [1] |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of period at Sep. 30, 2019 |  | 62,933 |  | $ (28,207) | [1] | 45,854 | [2] | 44,017 | 950 | 62,614 | 319 |  |  |  |  |  |
Shares outstanding, balance at beginning of period (in shares) at Dec. 31, 2019 |  |  | 1,727 | (425) | [4] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period at Dec. 31, 2019 |  | 64,170 |  | $ (28,235) | [4] | 45,972 | [5] | 45,108 | 1,019 | 63,864 | 306 | (3) |  | (3) |  | (3) |
Shareholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | 2,012 |  |  |  |  |  | 2,007 |  | 2,007 | 5 |  |  |  |  |  |
Other comprehensive income (loss) |  | (332) |  |  |  |  |  |  | (332) | (332) |  |  |  |  |  |  |
Stock option activity, stock awards and other (in shares) |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option activity, stock awards and other |  | 208 |  |  |  | 208 | [5] |  |  | 208 |  |  |  |  |  |  |
ESPP issuances, net of purchase of treasury shares (in shares) | [4] |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
ESPP issuances, net of purchase of treasury shares |  | 53 |  | $ 53 | [4] |  |  |  |  | 53 |  |  |  |  |  |  |
Common stock dividends |  | (657) |  |  |  |  |  | (657) |  | (657) |  |  |  |  |  |  |
Other increases (decreases) in noncontrolling interests |  | 23 |  |  |  |  |  |  |  |  | 23 |  |  |  |  |  |
Shares outstanding, balance at end of period (in shares) at Mar. 31, 2020 |  |  | 1,729 | (424) | [4] |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of period at Mar. 31, 2020 |  | 65,474 |  | $ (28,182) | [4] | 46,180 | [5] | 46,455 | 687 | 65,140 | 334 |  |  |  |  |  |
Shares outstanding, balance at beginning of period (in shares) at Dec. 31, 2019 |  |  | 1,727 | (425) | [4] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period at Dec. 31, 2019 |  | 64,170 |  | $ (28,235) | [4] | 45,972 | [5] | 45,108 | 1,019 | 63,864 | 306 | $ (3) |  | $ (3) |  | $ (3) |
Shareholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) |  | 236 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares outstanding, balance at end of period (in shares) at Sep. 30, 2020 |  |  | 1,732 | (423) | [4] |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of period at Sep. 30, 2020 |  | 69,112 |  | $ (28,164) | [4] | 46,388 | [5] | 49,328 | 1,255 | 68,807 | 305 |  |  |  |  |  |
Shares outstanding, balance at beginning of period (in shares) at Mar. 31, 2020 |  |  | 1,729 | (424) | [4] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period at Mar. 31, 2020 |  | 65,474 |  | $ (28,182) | [4] | 46,180 | [5] | 46,455 | 687 | 65,140 | 334 |  |  |  |  |  |
Shareholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | 2,986 |  |  |  |  |  | 2,975 |  | 2,975 | 11 |  |  |  |  |  |
Other comprehensive income (loss) |  | 526 |  |  |  |  |  |  | 526 | 526 |  |  |  |  |  |  |
Stock option activity, stock awards and other (in shares) |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option activity, stock awards and other |  | 96 |  |  |  | 96 | [5] |  |  | 96 |  |  |  |  |  |  |
Purchases of treasury shares, net of ESPP issuances (in shares) | [4] |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of treasury shares, net of ESPP issuances |  | (53) |  | $ (53) | [4] |  |  |  |  | (53) |  |  |  |  |  |  |
Common stock dividends |  | (662) |  |  |  |  |  | (662) |  | (662) |  |  |  |  |  |  |
Other increases (decreases) in noncontrolling interests |  | (12) |  |  |  |  |  |  |  |  | (12) |  |  |  |  |  |
Shares outstanding, balance at end of period (in shares) at Jun. 30, 2020 |  |  | 1,732 | (425) | [4] |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of period at Jun. 30, 2020 |  | 68,355 |  | $ (28,235) | [4] | 46,276 | [5] | 48,768 | 1,213 | 68,022 | 333 |  |  |  |  |  |
Shareholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | 1,219 |  |  |  |  |  | 1,224 |  | 1,224 | (5) |  |  |  |  |  |
Other comprehensive income (loss) |  | 42 |  |  |  |  |  |  | 42 | 42 |  |  |  |  |  |  |
Stock option activity, stock awards and other |  | 112 |  |  |  | 112 | [5] |  |  | 112 |  |  |  |  |  |  |
ESPP issuances, net of purchase of treasury shares (in shares) | [4] |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
ESPP issuances, net of purchase of treasury shares |  | 71 |  | $ 71 | [4] |  |  |  |  | 71 |  |  |  |  |  |  |
Common stock dividends |  | (664) |  |  |  |  |  | (664) |  | (664) |  |  |  |  |  |  |
Other increases (decreases) in noncontrolling interests |  | (23) |  |  |  |  |  |  |  |  | (23) |  |  |  |  |  |
Shares outstanding, balance at end of period (in shares) at Sep. 30, 2020 |  |  | 1,732 | (423) | [4] |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of period at Sep. 30, 2020 |  | $ 69,112 |  | $ (28,164) | [4] | $ 46,388 | [5] | $ 49,328 | $ 1,255 | $ 68,807 | $ 305 |  |  |  |  |  |
[1] | Treasury shares include 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.
[2] | 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.
[3] | Reflects the adoption of Accounting Standards Update (“ASU”) 2016-02, Leases (Topic 842), which resulted in an increase to retained earnings of $178 million during the three months ended March 31, 2019.
[4] | Treasury shares include 1 million shares held in trust and treasury stock includes $29 million related to shares held in trust as of September 30, 2020, June 30, 2020, March 31, 2020 and December 31, 2019.
[5] | Common stock and capital surplus includes the par value of common stock of $17 million as of September 30, 2020, June 30, 2020, March 31, 2020 and December 31, 2019.

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- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. 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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant