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Acquisitions (Pro forma) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Business Acquisition [Line Items] |  |  |  |
Net premiums earned | $ 10,999 | $ 9,549 | $ 21,141 | $ 18,286
Cigna's Life Insurance Business in Asia-Pacific Markets [Member] | Pro Forma |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net premiums earned |  | 10,299 |  | 19,811
Total revenues |  | 10,620 |  | 21,037
Net income |  | $ 1,276 |  | $ 3,335

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