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Stock Incentive Plans - Stock-Based Compensation Expense and ESPP (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 28, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation expense | $ 453 | $ 280 | $ 234 |
Shares issued employee stock purchase plan (in shares) | 2,000,000 |  |  |
Average purchase price of shares purchased (in dollars per share) | $ 53.29 |  |  |
Employee Stock Options and Stock Appreciation Rights |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation expense | $ 76 | 70 | 65 |
Compensation not yet recognized, period for recognition | 2 years 1 month 6 days |  |  |
Compensation not yet recognized, options | $ 41 |  |  |
Expected to vest (in shares) | 10,000,000 |  |  |
Restricted Stock Units and Performance Share Units |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation expense | $ 377 | 210 | 169 |
Compensation not yet recognized, other than options | $ 524 |  |  |
Compensation not yet recognized, period for recognition | 2 years 2 months 12 days |  |  |
Vested in period, fair value | $ 265 | 262 | $ 175 |
Stock Appreciation Rights (SARs) |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Award vesting period | 3 years |  |  |
Accelerated compensation cost |  | 14 |  |
Expiration period | 10 years |  |  |
Restricted Stock |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Accelerated compensation cost |  | $ 27 |  |
Employee Stock Option |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Award vesting period | 4 years |  |  |
Employee Stock |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Number of shares authorized | 30,000,000 |  |  |
Number of shares available for grant | 7,000,000 |  |  |
Offering period | 6 months |  |  |
Purchase price of common stock percent | 90.00% |  |  |
Minimum |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Award vesting period | 3 years |  |  |
Maximum |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Award vesting period | 5 years |  |  |
CVS Health 2017 Incentive Compensation Plan |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Number of shares authorized | 32,000,000 |  |  |
Number of shares available for grant | 17,000,000 |  |  |
Aetna Inc 2010 Stock Incentive Plan |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Number of shares available for grant | 27,000,000 |  |  | 32,000,000
Capital shares reserved for future issuance |  |  |  | 22,000,000

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