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Stockholders' Equity (Details) - USD ($) shares in Thousands, $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jan. 23, 2020 | Jan. 31, 2020 | Mar. 31, 2020 | Jun. 30, 2020 | Jun. 30, 2019
Business Acquisition [Line Items] |  |  |  |  |
Common stock repurchases |  |  |  | $ 561 | $ 37
Remaining number of shares available under the program (in shares) |  |  |  | 5,488 |
WellCare Health Plans, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Shares issued (in shares) | 171,000 | 171,000 |  |  |
Consideration transferred, shares valued | $ 11,431 | $ 11,431 |  |  |
Cash paid | 6,079 |  |  |  |
Consideration transferred related to fair value of replacement equity awards associated with pre-combination service | $ 95 |  |  |  |
Stock Repurchase Program |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Common stock repurchases (in shares) |  |  | 8,672 |  |
Common stock repurchases |  |  | $ 500 |  |

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