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Condensed Consolidated Statements of Shareholder's Equity (Parentheticals) (Parentheticals) - USD ($) shares in Millions, $ in Millions | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Treasury Stock, Shares, Held in Trust | 1 | 1 | 1 |  | 1
Treasury Stock, Value, Shares Held In Trust | $ 29 | $ 29 | $ 31 |  | $ 31
Common Stock, Value, Issued | 17 | $ 17 | 17 |  | $ 17
Adoption of new accounting standard | 178 |  | (13) | [1] |
CVS Health Shareholders' Equity |  |  |  |  |
Adoption of new accounting standard | 178 |  | (13) | [1] |
Accumulated Other Comprehensive Loss |  |  |  |  |
Adoption of new accounting standard | $ 0 |  | $ (7) | [1] |
[1] | (3)Reflects the adoption of ASU 2014-09, Revenue from Contracts with Customers, which resulted in a reduction to retained earnings of $13 million and the adoption of ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, which resulted in a reduction to accumulated other comprehensive income and an increase to retained earnings of $7 million.

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