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Acquisitions (Pro forma) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Business Acquisition [Line Items] |  |  |
Net premiums earned | $ 45,712 | $ 40,360 | $ 36,292
Cigna's Life Insurance Business in Asian Markets | Pro Forma |  |  |
Business Acquisition [Line Items] |  |  |
Net premiums earned |  | 41,884 | 39,432
Total revenues |  | 44,605 | 44,072
Business Acquisition, Pro Forma Net Income (Loss) |  | 5,533 | $ 8,906
Huatai Group [Member] | Pro Forma |  |  |
Business Acquisition [Line Items] |  |  |
Net premiums earned | 46,502 | 41,903 |
Total revenues | 50,550 | 44,936 |
Business Acquisition, Pro Forma Net income (loss), Including Portion Attributable to Noncontrolling Interests | 8,850 | 5,290 |
Business Acquisition, Pro Forma Net Income (Loss) | $ 8,859 | $ 5,267 |

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