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Stockholders' Equity - Narrative (Details) | 1 Months Ended | 12 Months Ended | 14 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2020 USD ($) shares | Dec. 31, 2022 USD ($) vote $ / shares shares | Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Jan. 31, 2023 USD ($) | Dec. 31, 2021 $ / shares shares | Nov. 30, 2021 USD ($) | Jan. 31, 2021 USD ($) | Nov. 30, 2019 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred Stock, shares authorized (in shares) | shares |  | 30,000,000 |  |  |  | 30,000,000.0 |  |  |
Sanofi |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Cost of stock repurchased | $ 5,000,000,000 |  |  |  |  |  |  |  |
Number of shares sold (in shares) | shares | 13,014,646 |  |  |  |  |  |  |  |
Treasury stock, shares acquired (in shares) | shares | 9,806,805 |  |  |  |  |  |  |  |
Common Stock, shares outstanding (in shares) | shares | 400,000 |  |  |  |  |  |  |  |
Libtayo Development and Dupilumab/Itepekimab Eligible Investments |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Cost of stock repurchased |  |  | $ 135,000,000 |  |  |  |  |  |
Bayer |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Maximum percentage of outstanding shares that may be acquired, under 'standstill' provisions |  | 20.00% |  |  |  |  |  |  |
Teva |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Maximum percentage of outstanding shares that may be acquired, under 'standstill' provisions |  | 5.00% |  |  |  |  |  |  |
January 2021 Share Repurchase Program |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  | $ 1,500,000,000 |
November 2021 Share Repurchase Program |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  | $ 3,000,000,000 |  |
Remaining authorized repurchase amount |  | $ 745,200,000 |  |  |  |  |  |  |
2019 Share Repurchase Program |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  | $ 1,000,000,000
Cost of stock repurchased |  |  |  | $ 1,000,000,000 |  |  |  |  |
Share Repurchase Program, January 2023 | Subsequent Event |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 3,000,000,000 |  |  |  |
Class A Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common Stock, shares authorized (in shares) | shares |  | 40,000,000 |  |  |  | 40,000,000.0 |  |  |
Common Stock, par value (in dollars per share) | $ / shares |  | $ 0.001 |  |  |  | $ 0.001 |  |  |
Number of votes per share | vote |  | 10 |  |  |  |  |  |  |
Common Stock, shares outstanding (in shares) | shares |  | 1,800,000 |  |  |  | 1,800,000 |  |  |
Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common Stock, shares authorized (in shares) | shares |  | 320,000,000 |  |  |  | 320,000,000.0 |  |  |
Common Stock, par value (in dollars per share) | $ / shares |  | $ 0.001 |  |  |  | $ 0.001 |  |  |
Number of votes per share | vote |  | 1 |  |  |  |  |  |  |

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